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- Currency converterConverts between about 30 currencies with the European Central Bank's daily reference rates, and shows the day they were set.Money & finance
- Percentage calculatorPercent of a number, what percent one number is of another, percentage change and difference, and the number before a discount.Math & numbers
- Mortgage calculatorSee your monthly payment, total interest and how your loan shrinks over time.Money & finance
- BMI calculatorYour BMI and its WHO adult category, the normal-weight range for your height, and what BMI cannot tell you.Health & fitness
- Countdown timerA little time, clearly counted.Date & time
- Password generatorA random password made on your device, with its strength in bits and nothing sent anywhere.Web & developer
- QR code generatorStatic codes made on your device: no expiry, no redirects, no scan tracking.Media and files
- Word countWords, characters and reading time as you type.Text tools
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- Currency converterConverts between about 30 currencies with the European Central Bank's daily reference rates, and shows the day they were set.
- Mortgage calculatorSee your monthly payment, total interest and how your loan shrinks over time.
- Loan calculatorPayment, interest and fees of any loan: annuity or equal principal, monthly or less often.
- VAT calculatorAdd VAT to a price or take it out, with the standard and reduced VAT rates of your country.
- Prize wheelList your prizes, spin the wheel and give them out one by one: a fair draw for raffles, parties and events.
- Concrete calculatorCubic metres or yards of concrete and bags of pre-mix for a slab, a footing or post holes.
- Country codesISO 3166 alpha-2, alpha-3 and numeric codes, calling codes and domains of 249 countries and territories.
- Dice rollerRoll one die or a handful, d20 or 3d6+2, with fair results you can see on the whole screen.
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- Length ConverterConvert between metric and imperial lengths, exactly.
- Temperature ConverterCelsius, Fahrenheit, kelvin, Rankine and oven gas marks, exactly.
- Angle converterConvert between degrees, radians, gradians, arcminutes, arcseconds, turns and mils.
- Area converterConvert between square metres, hectares, acres, square feet, square miles and more, exactly.
- Percentage calculatorPercent of a number, what percent one number is of another, percentage change and difference, and the number before a discount.
- Area of shapesArea and perimeter of rectangles, circles, triangles and eight more shapes, drawn to scale.
- Average calculatorMean, median, mode and range of a list of numbers, with the count, sum, smallest and largest.
- Combinations and permutations calculatorExact counts of combinations and permutations, with or without repetition, and the chance of one particular pick.
- Ohm's law calculatorGive any two of voltage, current, resistance and power to get the other two.
- Resistor colour code calculatorTurn 4, 5 or 6 colour bands into ohms and tolerance, or find the bands of a value.
- Series and parallel calculatorCombine 2 to 12 resistors or capacitors and see the equivalent value.
- Tone GeneratorPlay a test tone from 1 Hz to 20 kHz and see its note, period and wavelength.
- Airline codesFind any airline by its IATA or ICAO code, radio call sign or name: both codes, call sign, country and whether it still flies.
- Airport codesFind any airport by its IATA or ICAO code, name or city: codes, location, elevation and scheduled service.
- Airspeed converterIndicated, true and equivalent airspeed and Mach number at any altitude and temperature, with the 2% rule of thumb beside the exact answer.
- Altimeter settingsAltitude on QNH, flight level and QFE side by side, with hPa ↔ inHg ↔ mmHg, the transition level, cruising levels and the cold-temperature correction.
- Password generatorA random password made on your device, with its strength in bits and nothing sent anywhere.
- Browser infoBrowser, engine and device facts, reported here.
- Color contrast checkerCheck the WCAG contrast of text on a background, see which levels it passes, and get a nearby color that does.
- Color converterPick or type any color and copy it as HEX, RGB, HSL, HWB or OKLCH, with its nearest CSS name.
- BMI calculatorYour BMI and its WHO adult category, the normal-weight range for your height, and what BMI cannot tell you.
- Blood alcohol calculatorA rough estimate of your blood alcohol in per mille (‰) and how long your body takes to clear it, by the Widmark formula.
- Blood sugar converterConvert blood glucose between mmol/L and mg/dL, and HbA1c between mmol/mol and %, with the estimated average glucose.
- Body fat calculatorAn estimate of your body fat percentage from a tape measure: height, neck and waist, plus the hip for women, by the US Navy method.
- QR code generatorStatic codes made on your device: no expiry, no redirects, no scan tracking.
- Aspect ratio calculatorFind the aspect ratio of a width and height, or resize a picture or video to a new width or height without stretching it.
- Barcode generatorEAN-13, EAN-8, UPC-A, Code 128 and Finnish bank barcodes, ready to download.
- Image compressMake a photo's file smaller and see how much you saved. It stays on your device.
- Chord finderPick a root and a chord type to see its notes and formula on a piano, hear it, or pick notes to find the chord's name.
- Circle of fifthsPick a key on the circle of fifths to see its key signature, relative key, scale and chords, and hear them on a piano.
- Drum machineBuild a 16-step drum pattern with kick, snare, hi-hats, clap and tom, play it at your tempo and tap live pads on top.
- Metronome: steady beats for music practiceSet the tempo, hear the beat and follow the pendulum.
- Word countWords, characters and reading time as you type.
- Base64 encode and decodeEncode text or a file to Base64 and decode it back, right in your browser.
- Braille translatorTurn text into Unified English Braille cells and back: letters, capitals, numbers and basic punctuation.
- Case converterChange letter case and copy any version.
- Dashboard warning lightsFind a car warning light by its symbol or name: what it means, how urgent it is by colour, and what to do now.
- EV charging calculatorCharging time, energy from the grid and cost for any charger, with losses and the car's own limits.
- EV range calculatorEstimate the range from battery size, consumption and charge level, with a cold-weather option.
- Home charger powerPhases, amps and volts to charging power and the time to add the energy you need.
- Battery sizesEvery common battery size, from AAA to D, 9 V, CR2032 and LR44 button cells to 18650: dimensions, voltage, IEC names and equivalents.
- E-series preferred valuesFind the nearest E3 to E192 value to the one you need, with its neighbours and error.
- Logic gatesSwitch the inputs and see each logic gate's output at once, with its symbol in both standard styles, its Boolean expression and truth table.
- Drone flight timeFlight time from the battery’s mAh and voltage or Wh and the average draw, with a landing reserve and the energy in Wh.
- Dew point calculatorFind the dew point from temperature and humidity, or the humidity from the dew point.
- Wind chill and heat indexThe feels-like temperature: wind chill in the cold, heat index in the heat.
- Beaufort wind scaleTurn a wind speed in m/s, km/h, knots or mph into its Beaufort force and name.
- Country codesISO 3166 alpha-2, alpha-3 and numeric codes, calling codes and domains of 249 countries and territories.
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