470 tools · live where a source exists
Tools
Each tool does one job. A live tool reads a public source when you ask and shows that answer. A local tool computes on this server and does not call out. An empty result stays empty.
470 of 470
Numbers
- Computed here
VAT
Add a percent tax onto a net amount, or take it back out of a gross amount.
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Margin
Profit margin from a cost and a selling price.
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Markup
Selling price from a cost and a markup percent.
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Discount
Price after a percent off, and the amount saved.
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Tip split
A bill plus a tip, split across the people you type.
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CAGR
The compound yearly rate that links a start value, an end value, and a number of years.
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Rule of 72
Years to double at a yearly percent, using 72 divided by the rate.
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Future value
What a lump sum grows to at a yearly percent, compounded once a year.
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Present value
What a future amount is worth today at a yearly percent.
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Annuity
The future value of a payment made at the end of each year.
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NPV
Net present value of cash flows. The first number is the yearly percent.
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WACC
Weighted average of an equity rate and a debt rate. Weights are percents.
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CAPM
Risk-free rate plus beta times a market premium. All three numbers are ones you type.
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One-day VaR
A one-day figure at 1.65 standard deviations from a value and a daily volatility percent.
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ROI
Gain divided by cost, as a percent.
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Unit break-even
How many units cover a fixed cost when each unit clears price minus variable cost.
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Order quantity
Economic order quantity from yearly demand, a setup cost, and a holding cost.
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Straight line
Yearly straight-line depreciation from cost, salvage, and years.
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First payment
Monthly payment on a loan, and how the first month splits into interest and principal.
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Bond price
Price of an annual coupon bond from face, coupon percent, yield percent, and years.
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Black–Scholes
A European call and put from a spot, strike, rate, volatility, and years you type.
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Cross rate
Multiply two rates you already have. It does not look up a market.
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Pip risk
Cash at risk from a notional, a pip size, and a stop in pips.
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Simple interest
Interest on a principal at a yearly percent for a number of years, without compounding.
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Real rate
Fisher’s real rate from a nominal percent and an inflation percent.
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Hourly pay
Yearly pay divided by the hours you type.
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Overtime
Pay for a block of hours at a multiplier. The third number is the multiplier.
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GCD
Greatest common divisor of two whole numbers.
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LCM
Least common multiple of two whole numbers.
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Factors
Prime factors of a whole number up to one trillion.
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Factorial
n! for a whole number from 0 to 18, where the result still fits exactly.
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Combinations
How many ways to choose k items from n.
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Stats
Count, min, max, mean, median, and a sample standard deviation.
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Quadratic
Roots of a x² + b x + c.
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Fraction
A decimal as a fraction in lowest terms.
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Ratio
Two numbers in lowest terms.
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Roman
An integer as a Roman numeral, or a Roman numeral as an integer.
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Base convert
An integer from one base to another. Bases run from 2 to 36.
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Line fit
Slope and intercept of a straight line through x y pairs.
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Percentile
Nearest-rank percentile. The first number is the percent, then the sample.
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Hypotenuse
Hypotenuse of a right triangle from the two shorter sides.
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Circle
Circumference and area of a circle from its radius.
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Sphere
Surface area and volume of a sphere from its radius.
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Triangle area
Area of a triangle from base and height.
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Trapezoid
Area of a trapezoid from the two bases and the height.
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Cube
Volume and surface of a cube from one side.
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Cylinder
Volume of a cylinder from radius and height.
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Cone
Volume of a cone from radius and height.
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Midpoint
The point halfway between two coordinates.
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Distance
Straight-line distance between two coordinates.
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Heron
Area of a triangle from three side lengths.
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Log 10
Base-10 logarithm of a number above zero.
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Natural log
Natural logarithm of a number above zero.
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Power
A base raised to an exponent.
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Square root
Square root of a number that is zero or above.
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Cube root
Real cube root, including negatives.
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Remainder
Remainder of two whole numbers.
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Percent of
A percent of an amount. This is not a percent change.
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Share
What percent one number is of another.
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Proportion
A is to B as C is to the answer.
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Weighted average
Average when each value has its own weight.
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Harmonic mean
Harmonic mean of numbers above zero.
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Geometric mean
Geometric mean of numbers above zero.
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Z-score
How many standard deviations a point sits from a mean you type.
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Sigmoid
Logistic sigmoid of one number.
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Clamp
Pull a number into a low and high bound.
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Lerp
Linear blend from A to B by a fraction.
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Map range
Map a number from one range onto another.
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Round to step
Nearest multiple of a step.
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Scientific notation
Mantissa and power of ten. Zero is rejected.
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Per mille
A per-mille share of an amount. 5 of 1000 is 5.
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Parts per million
A ppm share of an amount. 5 of 1,000,000 is 5.
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BMI
Body mass index from kilograms and metres. A formula, not a diagnosis.
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Pace
Minutes per kilometre from distance and minutes.
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Litres per 100 km
Fuel use from kilometres driven and litres burned.
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Miles per gallon
Miles divided by US gallons. It does not convert litres.
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Ohm
Resistance from volts and amps.
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Watts
Power from volts and amps.
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Watts from resistance
Power from volts and ohms, volts squared over resistance.
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Charge
Charge in coulombs from amps and seconds.
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Frequency
Hertz from a period in seconds.
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Wavelength
Metres from hertz, using 299792458 metres per second.
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Decibel
Power-ratio decibels, 10 times log10 of the ratio.
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Half-life left
What remains after a number of exact halvings.
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Doubling time
Years to double at a continuous percent rate. This is ln 2 over the rate, not the rule of 72.
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Annuity due
Future value of a payment at the start of each period.
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Annuity present
Present value of a payment at the end of each period.
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Perpetuity
Present value of a payment that continues, payment divided by the rate.
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Sinking fund
Payment that grows to a target at a percent rate.
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Payback
Years until cash flows cover a cost. The last year can be a fraction.
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Price from margin
Selling price from a cost and a margin percent. Price is cost divided by 1 minus the margin.
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Allocate
Split an amount by weights.
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Pro rata
A yearly amount scaled to a number of days.
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Per diem
An amount divided by a number of days.
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Hourly from salary
A monthly salary divided by hours in the month.
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Week pay
Hourly rate times hours in the week.
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Commission
A percent commission on a sale.
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Two-bracket tax
Tax from one threshold and two rates you type. It is not a real tax table.
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Late fee
A percent of an amount for each day.
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Effective rate
Effective annual percent from a nominal percent and a number of compounds.
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Nominal rate
Nominal percent from an effective percent and a number of compounds.
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Double declining
Double-declining depreciation for one year. It stops at the salvage.
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Units of production
Depreciation for the units you made this period.
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Inventory turns
Cost of goods sold divided by inventory.
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Days sales
365 times inventory, divided by cost of goods sold.
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Current ratio
Current assets divided by current liabilities.
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Quick ratio
Quick assets divided by current liabilities.
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Debt ratio
Debt divided by assets, as a percent.
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Equity ratio
Equity divided by assets, as a percent.
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Return on assets
Net income divided by assets, as a percent. Not a forecast.
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Return on equity
Net income divided by equity, as a percent. Not a forecast.
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Earnings per share
Earnings divided by shares.
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Price to earnings
Price divided by earnings per share.
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PEG
A price-to-earnings figure divided by a growth percent you type.
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Dividend yield
Dividend divided by price, as a percent.
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Payout ratio
Dividends divided by earnings, as a percent.
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Fibonacci
The nth Fibonacci number. The first is 1 at n = 1, and 0 at n = 0.
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Triangular number
The nth triangular number, n times n plus 1, over 2.
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Permutations
Ordered ways to pick k items from n.
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Digit sum
The sum of the digits of a whole number.
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Digital root
Repeated digit sum, as 1 through 9, or 0.
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Prime check
Whether a whole number is prime.
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Percent error
Absolute gap divided by the true value, as a percent.
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Coefficient of variation
A standard deviation divided by a mean, as a percent.
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Mode
The value that appears most often. Two modes are rejected.
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Mean absolute deviation
Average distance from the mean of the list.
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Correlation
Pearson r for x y pairs you type.
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Binomial chance
Chance of k successes in n tries at a probability you type.
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Poisson chance
Chance of k events when the mean count is lambda.
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Expected value
Sum of value times probability. The probabilities have to add to 1.
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Standard error
A standard deviation divided by the square root of the count.
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Interval low
Mean minus 1.96 standard errors. The high side is the same distance up.
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Grade percent
Rise divided by run, as a percent.
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Sine
Sine of an angle in degrees.
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Cosine
Cosine of an angle in degrees.
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Tangent
Tangent of an angle in degrees.
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Law of cosines
The third side from two sides and the included angle in degrees.
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Interior angle
One interior angle of a regular polygon, in degrees.
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Arc length
Arc length from radius and degrees.
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Sector area
Sector area from radius and degrees.
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Annulus
Area of a ring from the outer and inner radius.
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Ellipse area
Area of an ellipse from the two radii.
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Box volume
Volume of a box from length, width, and height.
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Box diagonal
Space diagonal of a box.
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Pyramid volume
Volume of a rectangular pyramid, length times width times height over 3.
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Rectangle diagonal
Diagonal of a rectangle.
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Golden ratio
A length times the golden ratio.
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Catalan number
The nth Catalan number.
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GCD of a list
Greatest common divisor of two or more whole numbers.
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Sum of a list
The total of the numbers you type.
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Arithmetic series
Sum of an arithmetic series from the first term, the step, and the count.
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Geometric series
Sum of a geometric series from the first term, the ratio, and the count.
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Monthly compound
A balance after monthly compounding.
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Continuous compound
A balance after continuous compounding.
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After-tax yield
A yield percent after a tax percent you type.
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Taxable equivalent
The taxable yield that matches a tax-free yield.
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Cap rate
Net operating income divided by price, as a percent.
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Cash on cash
Annual cash flow divided by cash invested, as a percent.
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Gross rent multiple
Price divided by annual rent.
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Loan to value
Loan divided by value, as a percent.
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Debt to income
A monthly debt divided by monthly income, as a percent.
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Down payment
A percent of a price.
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Loan points
A percent of a loan, as a fee.
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Points payback
Months for a monthly saving to cover a points fee.
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Food energy
Kilocalories from protein, carbohydrate, and fat grams. 4, 4, and 9.
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Epley estimate
A one-rep estimate from a weight and a rep count. It is not a measured max.
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Momentum
Mass times velocity.
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Kinetic energy
One half mass times speed squared.
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Potential energy
Mass times 9.81 times height.
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Work
Force times distance.
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Mechanical power
Work divided by seconds.
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Force over area
Force divided by area.
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Density
Mass divided by volume.
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Hooke
Spring force, stiffness times stretch.
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Spring period
Period of a mass on a spring, 2 π times the square root of mass over stiffness.
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Pendulum
Period of a simple pendulum, 2 π times the square root of length over 9.81.
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Snell
Outgoing angle in degrees. n1, incident degrees, n2.
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Thin lens
Image distance from focal length and object distance.
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Magnification
Negative image distance over object distance.
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Series resistors
Two resistors in series.
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Parallel resistors
Two resistors in parallel.
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Series capacitors
Two capacitors in series.
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Parallel capacitors
Two capacitors in parallel.
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Voltage divider
Output from the input and the two resistors. The second resistor is the lower one.
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RC time
Resistance times capacitance, in seconds.
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Transformer
Secondary volts from primary volts and the two turn counts.
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Copper wire
Resistance of copper at room temperature. Rho is 1.68e-8. Area is square millimetres.
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Dew point
Dew point in Celsius from an air temperature and a relative humidity, using the Magnus formula.
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Wind chill
Environment Canada wind chill from Celsius and wind in kilometres per hour.
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Heat index
Rothfusz heat index from Fahrenheit and relative humidity.
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Ideal gas
Moles from pressure in kilopascals, volume in litres, and Celsius, using R = 8.314462618.
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Density
Mass divided by volume. You type both.
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Acceleration
Change in speed divided by seconds.
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Impulse
Force in newtons times seconds.
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Period
Seconds in one cycle, from a frequency in hertz.
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Beat frequency
The absolute gap between two frequencies.
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Voltage decibels
20 times log10 of a voltage divided by a reference voltage.
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Decay constant
Natural log of 2, divided by a half-life you type.
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Periods to grow
How many periods a present amount needs to reach a future amount at a percent per period.
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Saving payment
The payment at the end of each period that reaches a future amount.
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Rule of 70
Years to double using 70 divided by a yearly percent.
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Contribution
Price minus variable cost for one unit.
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Price from margin
Selling price from a cost and a margin percent.
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Stacked discount
A price after two percent discounts, applied one after the other.
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Even split
An amount divided by a number of people.
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Scale a ratio
Multiply both parts of a ratio by a factor.
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Aspect ratio
Width and height in lowest whole terms.
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Screen density
Pixels per inch from a pixel width, a pixel height, and a diagonal in inches.
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Storage time
Days a gibibyte budget lasts at a mebibyte-per-day pace.
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Download time
Seconds to move a number of megabytes at a megabit-per-second rate.
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Raw video rate
Megabits per second for uncompressed frames: width, height, frames per second, and bits per pixel.
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Odd or even
Whether a whole number is odd or even.
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Collatz steps
How many steps of the 3n+1 rule it takes to reach 1.
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Happy number
Whether repeated sums of squared digits reach 1.
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Narcissistic
Whether a whole number equals the sum of its digits raised to the number of digits.
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Perfect number
Whether the proper divisors add up to the number.
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Abundant number
Whether the proper divisors add up to more than the number.
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Next prime
The next prime strictly above a whole number.
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Prime count
How many primes are at or below a whole number, up to 100,000.
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Euler totient
How many whole numbers below n share no factor with n.
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Modular power
A base raised to an exponent, then the remainder.
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Max heart rate
220 minus an age. A formula, not a measurement.
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Heart zone
A percent of 220 minus an age.
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Riegel time
A longer race time from a shorter one. T2 = T1 × (D2 / D1) ^ 1.06.
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Slope angle
Degrees of a slope from rise and run.
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Concrete volume
Cubic metres from length, width, and thickness, all in metres.
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Tile count
How many tiles cover an area, rounded up.
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Paint
Litres from an area and the square metres one litre covers.
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Recipe scale
Scale an ingredient from one serving count to another.
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Baker's percent
An ingredient weight from a flour weight and a baker's percent.
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US proof
US proof from an alcohol percent. Proof is twice the percent.
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Proof to percent
Alcohol percent from a US proof.
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Rough ABV
A brewing rule of thumb: (original gravity − final gravity) × 131.25.
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Dilution
Volume of concentrate for C1 × V1 = C2 × V2. You type C1, V2, and C2.
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Molarity
Moles divided by litres.
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pH from concentration
Minus log10 of a hydrogen-ion concentration you type, in moles per litre.
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pOH
14 minus a pH you type, at the usual room-temperature relation.
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Watt hours
Watts times hours.
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Electricity cost
Kilowatt hours times a price per kilowatt hour you type.
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Wire gauge
Millimetres for an American wire gauge number, from the ASTM formula.
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dBm to milliwatts
Milliwatts from dBm. 0 dBm is 1 milliwatt.
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Nyquist rate
Twice a frequency, in samples per second.
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Signal to noise
10 times log10 of a signal power divided by a noise power.
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IPv4 integer
An IPv4 address as a whole number.
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Integer to IPv4
A whole number from 0 to 4294967295 as an IPv4 address.
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CIDR hosts
Usable IPv4 hosts in a prefix. /31 has 2 and /32 has 1.
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8-bit not
Flip the low 8 bits of a whole number from 0 to 255.
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Bit and
Bitwise AND of two whole numbers.
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Bit or
Bitwise OR of two whole numbers.
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Bit xor
Bitwise XOR of two whole numbers.
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Shift left
A whole number shifted left by a count from 0 to 16.
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Bit count
How many bits are 1 in a whole number.
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Year at 2080
Yearly pay divided by 2,080 hours. That is a 40-hour week for 52 weeks.
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Year to month
Yearly pay divided by 12.
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Year to week
Yearly pay divided by 52.
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Biweekly pay
Yearly pay divided by 26.
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Day rate
Yearly pay divided by 260 working days.
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Gross from net
The gross that leaves a net after a tax percent you type.
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Percent of
A percent of an amount. 25 of 200 is 50.
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Unit price
Price divided by a quantity.
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Rule of three
If A lines up with B, what lines up with C.
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Log base 10
Common logarithm of a number above zero.
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Natural log
Natural logarithm of a number above zero.
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Exponential
e raised to the power you type.
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Reciprocal
One divided by the number you type.
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Remainder
The remainder after dividing one whole number by another.
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Clamp
A number pulled inside a low and a high.
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Round
A number rounded to a count of decimal places.
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Perfect square
Whether a whole number is a square.
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Perfect cube
Whether a whole number is a cube.
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Triangular
The nth triangular number, n times n plus one, over 2.
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Handshakes
How many handshakes happen if each person shakes hands once with every other.
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Shared birthday
The chance, in a group of this size, that at least two people share a birthday. 365 days, leap days ignored.
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Bayes percent
The chance a positive result is a true positive, from a prior, a sensitivity, and a false-positive percent.
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Haversine
Great-circle kilometres between two latitudes and longitudes. Earth radius is 6371 km.
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Torus volume
Volume of a ring torus from the tube centre radius and the tube radius.
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Frustum
Volume of a cone frustum from height and the two radii.
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Sphere cap
Volume of a spherical cap from the sphere radius and the cap height.
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Chord
Chord length from a radius and the distance from the centre to the chord.
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Units
- Computed here
Length
Millimetres, centimetres, metres, kilometres, inches, feet, yards, and miles.
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Mass
Grams, kilograms, tonnes, ounces, and pounds.
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Temperature
Celsius, Fahrenheit, and kelvin.
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Volume
Millilitres, litres, US cups, US fluid ounces, and US gallons.
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Data size
Bytes with decimal KB and binary KiB units.
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Speed
Metres per second, kilometres per hour, miles per hour, and knots.
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Area
Square metres, square feet, hectares, acres, and square kilometres.
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Energy
Joules, kilojoules, calories, kilocalories, watt hours, and kilowatt hours.
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Pressure
Pascal, kilopascal, bar, atmosphere, and psi.
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Angle
Degrees and radians.
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Cooking
Millilitres, litres, US teaspoons, tablespoons, cups, and fluid ounces.
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Nautical mile
Kilometres in a number of international nautical miles.
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Light-year
Kilometres in a number of light-years.
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Parsec
Light-years in a number of parsecs.
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Furlong
Metres in a number of furlongs.
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Stone
Kilograms in a number of stones.
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Horsepower
Watts in a number of mechanical horsepower.
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Pound-force
Newtons in a number of pounds-force.
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Newton metre
Pound-feet in a number of newton metres.
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Pace to miles
Minutes per mile from a minutes-per-kilometre pace.
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Réaumur
Celsius from a Réaumur temperature.
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Printer point
Millimetres in a number of PostScript points.
Open → - Computed here
Hand
Centimetres in a number of hands.
Open → - Computed here
Cable
Metres in a number of international cables.
Open → - Computed here
League
Kilometres in a number of land leagues of three miles.
Open → - Computed here
Acre-foot
Cubic metres in a number of acre-feet.
Open → - Computed here
Cord
Cubic metres in a number of cords of wood.
Open → - Computed here
US bushel
Litres in a number of US bushels.
Open → - Computed here
BTU
Joules in a number of international BTU.
Open → - Computed here
Therm
Kilowatt hours in a number of US therms.
Open → - Computed here
Cooling ton
Watts in a number of refrigeration tons.
Open → - Computed here
Imperial gallon
Litres in a number of imperial gallons.
Open → - Computed here
Inch of mercury
Kilopascals in a number of inches of mercury.
Open → - Computed here
Torr
Pascals in a number of torr.
Open → - Computed here
Kilogram-force
Newtons in a number of kilograms-force.
Open → - Computed here
Dyne
Newtons in a number of dynes.
Open → - Computed here
Erg
Joules in a number of ergs.
Open → - Computed here
Foot-candle
Lux in a number of foot-candles.
Open → - Computed here
Gauss
Teslas in a number of gauss.
Open → - Computed here
Rem
Sieverts in a number of rem.
Open → - Computed here
Rad
Grays in a number of rad.
Open → - Computed here
Angstrom
Nanometres in a number of angstroms.
Open → - Computed here
Mil
Millimetres in a number of mils (thousandths of an inch).
Open → - Computed here
Micrometre
Millimetres in a number of micrometres.
Open → - Computed here
L/100km to mpg
US miles per gallon from litres per 100 kilometres, using 235.214583.
Open → - Computed here
Rankine
Rankine from Fahrenheit, by adding 459.67.
Open → - Computed here
Nautical miles
Nautical miles as kilometres. One nautical mile is 1.852 km.
Open → - Computed here
Knots
Knots as kilometres per hour. One knot is 1.852 km/h.
Open → - Computed here
Pounds to stone
Pounds divided by 14.
Open → - Computed here
Stone to kg
Stones as kilograms. One stone is 6.35029318 kg.
Open → - Computed here
Carats
Metric carats as grams. One carat is 0.2 g.
Open → - Computed here
Troy ounces
Troy ounces as grams. One troy ounce is 31.1034768 g.
Open → - Computed here
Pixels to rem
Pixels divided by 16, the usual root size.
Open →
Time
- Computed here
Add days
A UTC date plus a number of days. A negative number goes backward.
Open → - Computed here
Weekday
The weekday of a UTC date.
Open → - Computed here
ISO week
The ISO week number and the ISO week-year of a date.
Open → - Computed here
Quarter
The calendar quarter of a date.
Open → - Computed here
Business days
Monday to Friday dates after the first date and through the second, in UTC.
Open → - Open
World clock
The current time in UTC, New York, London, Hong Kong, Tokyo, and Sydney.
Open → - Computed here
Countdown
Days from today UTC until a date. A past date is a negative count.
Open → - Computed here
Hours minutes
Seconds as hours, minutes, and seconds, or a h:m:s clock as seconds.
Open → - Computed here
Month end
The last UTC day of the month that contains the date.
Open → - Computed here
Span
Days, hours, and minutes between two UTC dates.
Open → - Computed here
Leap year
Whether a year is a Gregorian leap year.
Open → - Computed here
Day of year
The day number inside a year.
Open → - Computed here
Days in month
How many days that month has.
Open → - Computed here
Add months
A date plus a number of months. The day clamps to the month.
Open → - Computed here
Add years
A date plus a number of years. 29 February clamps.
Open → - Computed here
Easter
Western Easter Sunday for a year, Anonymous Gregorian.
Open → - Computed here
Julian day
The Julian day number at UTC midnight.
Open → - Computed here
Century
The century a year sits in. 2026 is the 21st.
Open → - Computed here
Season
Meteorological season in the northern hemisphere.
Open → - Computed here
Chinese zodiac
The animal for a Gregorian year, counted from a Rat year of 4.
Open → - Computed here
Sun sign
The tropical sign for a month and a day. It is a calendar label.
Open → - Computed here
Completed years
Whole years from the first date to the second. The anniversary has to have arrived.
Open → - Computed here
Sleep cycles
Hours in a number of 90-minute sleep cycles.
Open → - Computed here
Offset gap
Hours between two UTC offsets you type.
Open → - Computed here
Swatch beat
Internet time at a UTC hour, minute, and second. A beat is 86.4 seconds, counted from UTC+1.
Open → - Computed here
Moon phase
An approximate phase name for a UTC date, counted from 6 January 2000.
Open → - Computed here
Add weeks
A date plus a number of weeks.
Open → - Computed here
Add days
A UTC date plus a whole number of days.
Open → - Computed here
Reading minutes
Minutes to read a word count at a words-per-minute pace you type.
Open → - Computed here
Pomodoro split
How many 25-minute blocks fit in the minutes you type, and what is left.
Open →
Color
- Computed here
Hex to RGB
A hex color as red, green, and blue from 0 to 255.
Open → - Computed here
HSL to hex
Hue, saturation, and lightness as a hex color.
Open → - Computed here
Complement
The color opposite a hex color on the hue wheel.
Open → - Computed here
Mix colors
A blend of two hex colors. The third number is the percent of the second color.
Open → - Computed here
Luminance
WCAG relative luminance of a hex color.
Open → - Computed here
Tints
Four steps from a hex color toward white.
Open → - Computed here
Two-color contrast
WCAG contrast ratio of two hex colors, and whether it clears AA body text.
Open → - Computed here
Grayscale
A hex color as a gray of the same display brightness.
Open → - Computed here
RGB to hex
Red, green, and blue from 0 to 255 as a hex color.
Open → - Computed here
Invert hex
The hex color with each channel flipped.
Open → - Computed here
Hex to CMYK
A hex color as cyan, magenta, yellow, and black percents.
Open →
Text
- Computed here
Case
Upper case, lower case, title case, snake case, and kebab case.
Open → - Computed here
Reverse
The text reversed, and the words in reverse order.
Open → - Computed here
Sort lines
Lines in A to Z order, blanks removed.
Open → - Computed here
Unique lines
Repeated lines dropped, first occurrence kept.
Open → - Computed here
ROT13
Letters rotated by 13. Digits and spaces stay put. Run it again to undo.
Open → - Computed here
Morse
Latin letters and digits as Morse. A line of Morse is decoded when it starts with a dot or a dash.
Open → - Computed here
NATO
Letters spelled with the NATO phonetic alphabet.
Open → - Computed here
URL encode
Percent-encode text. Start the line with decode to reverse it.
Open → - Computed here
HTML escape
Escape <, >, &, and quotes so the text can sit in HTML.
Open → - Computed here
Find URLs
http and https links pulled out of a block of text.
Open → - Computed here
Find emails
Email-shaped addresses pulled out of a block of text. They are not checked with a mail server.
Open → - Computed here
Palindrome
Whether the letters and digits read the same backwards.
Open → - Computed here
Anagram
Whether two words use the same letters. Separate them with a comma.
Open → - Computed here
Name case
camelCase, snake_case, and kebab-case from a phrase.
Open → - Computed here
Initials
The first letter of each word.
Open → - Computed here
Entropy
A rough bit estimate from the length and the kinds of characters present.
Open → - Computed here
Code points
Unicode code points for the text, up to 40 characters.
Open → - Computed here
Normalize
NFC and NFD forms, and how many code points each uses.
Open → - Computed here
Strip invisible
Zero-width and other invisible characters removed, with a count of what was removed.
Open → - Computed here
MD5
MD5 hex of the text. It is a checksum, not a password store.
Open → - Computed here
SHA-1
SHA-1 hex of the text. Prefer SHA-256 when you have a choice.
Open → - Computed here
SHA-512
SHA-512 hex of the text.
Open → - Computed here
CRC-32
IEEE CRC-32 of the text, as eight hex digits.
Open → - Computed here
Caesar
Shift Latin letters by a whole number. Other characters stay.
Open → - Computed here
Atbash
Swap a with z, b with y, and the same for capitals.
Open → - Computed here
Pig Latin
One Latin word in pig Latin.
Open → - Computed here
Edit distance
Inserts, deletes, and swaps to turn one word into another.
Open → - Computed here
Hamming distance
Positions that differ. The two strings have to be the same length.
Open → - Computed here
Soundex
American Soundex code of one Latin word.
Open → - Computed here
Luhn check
Whether a digit string passes the Luhn checksum. Nothing is stored.
Open → - Computed here
ISBN-13 check
Whether 13 digits pass the ISBN checksum. It does not look up a book.
Open → - Computed here
Vowel count
How many A, E, I, O, and U letters are in the text.
Open → - Computed here
ROT47
Printable ASCII rotated by 47. Run it again to undo.
Open → - Computed here
Word count
How many words are in the text, split on spaces.
Open → - Computed here
Character count
How many characters are in the text, including spaces.
Open → - Computed here
Sentence count
How many sentence enders (. ! ?) are in the text.
Open → - Computed here
Reading time
Minutes at 200 words per minute.
Open → - Computed here
Hex bytes
Each character as a hex byte. The text has to be ASCII.
Open → - Computed here
Hex to text
ASCII text from space-separated hex bytes.
Open →
World
- Open-Meteo
Weather
The current temperature and the next three days for a city.
Open → - Open-Meteo
Air
The US AQI and PM2.5 at a city, read when you ask.
Open → - Open
Quakes
Earthquakes from the last day. Leave it blank for the significant ones, or type a place.
Open → - Nager.Date
Holidays
Public holidays left in the year for a country.
Open → - World Bank
Country
Region, capital, income group, and coordinates for a country.
Open → - World Bank
Population
The latest population figure the World Bank published for a country.
Open → - Zippopotam
Postal code
The places a postal code maps to.
Open → - Open
Space station
Where the ISS is right now: latitude, longitude, altitude, and speed.
Open → - Open-Meteo
Sunrise
Today’s sunrise and sunset for a city.
Open →
Words
- Wiktionary
Define
English definitions for one word.
Open → - NCBI
Papers
PubMed titles for a medical or life-science search.
Open → - Open Library
Books
An ISBN, or a title search, from Open Library.
Open → - MusicBrainz
Artist
The closest MusicBrainz artist for a name.
Open → - Datamuse
Rhyme
Words that rhyme with the one you type.
Open → - Datamuse
Synonym
Words Datamuse lists as synonyms.
Open → - Datamuse
Related words
Words Datamuse associates with the one you type.
Open →
Web
- Google Public DNS
DNS
Public DNS answers for a hostname. Add a type, such as MX.
Open → - RDAP
Domain record
Registration status, nameservers, and events for a domain.
Open → - ipwho.is
IP address
Country, region, and network for a public IP you paste.
Open → - The feed you paste
Feed
The latest titles in a public RSS or Atom feed.
Open → - Internet Archive
Wayback
Whether the Internet Archive has a snapshot of a URL.
Open → - GitHub
GitHub user
Name, bio, public repos, and followers for a GitHub login.
Open → - Hacker News
HN user
Karma, about text, and the account date for a Hacker News user.
Open → - Open Food Facts
Barcode
The product name behind a barcode.
Open → - Frankfurter
ECB pair
The latest ECB fixing Frankfurter publishes for a currency pair.
Open → - Wikipedia
Wiki lead
The Wikipedia lead for a page title.
Open → - OpenStreetMap
Place
Latitude and longitude for a place name.
Open → - arXiv
Preprint
The first arXiv hit for a search.
Open →
Code
- npm
npm downloads
How many times an npm package was downloaded in the last week.
Open → - crates.io
Crate
Description, latest version, and downloads for a Rust crate.
Open → - RubyGems
Ruby gem
Version and download count for a Ruby gem.
Open → - Packagist
Composer
Description and a published version for a PHP package.
Open → - Crossref
DOI
Title, authors, and the link for a DOI.
Open →
Chain
Local
- Computed here
Address checksum
The EIP-55 checksum of an Ethereum-style address.
Open → - Computed here
SHA-256
The SHA-256 hex of the text you type.
Open → - Open
UUID
A random UUID version 4. Type a count from 1 to 10.
Open → - Open
ULID
A sortable ULID. Type a count from 1 to 10.
Open → - Computed here
JWT decode
The header and payload of a JWT. The signature is not checked.
Open → - Open
Unix time
Now as Unix time, or a timestamp turned into a UTC date.
Open → - Computed here
Cron
What a five-field cron expression means, and the next five UTC runs.
Open → - Computed here
Date gap
Days and weeks between two dates.
Open → - Computed here
Loan payment
The monthly payment for an amount, a yearly rate, and a term.
Open → - Computed here
Subnet
Network, broadcast, and host count for an IPv4 CIDR.
Open → - Computed here
Hex
A number shown in hex, decimal, and binary.
Open → - Computed here
IBAN
Whether an IBAN checksum is valid. It does not ask a bank.
Open → - Computed here
JSON
Pretty-print JSON, or show the parse error.
Open → - Computed here
Base64
Encode text, or decode it when the line starts with decode.
Open → - Computed here
Slug
A URL slug from a title.
Open → - Computed here
Word count
Characters, words, lines, and a reading time at 200 words a minute.
Open → - Computed here
Contrast
WCAG contrast of a hex color against black and white.
Open → - Open
Password
A random password of the length you type, from 12 to 64.
Open → - Computed here
CSV to JSON
Turn a small CSV, with a header row, into JSON.
Open → - Computed here
Regex
What a short JavaScript pattern matches in a sample.
Open → - Computed here
Semver
Which of two semantic versions is newer.
Open → - Computed here
Age
Years, months, and days since a birth date, in UTC.
Open → - Computed here
Percent change
The percent change from one number to another.
Open →