Every unit converter you need,
in one focused toolkit.
Length, weight, temperature, speed, currency, data storage, and more — 23 fast, accurate converters that run entirely in your browser. Nothing you type is ever sent to a server.
Pick a tool to get started
Every converter below works instantly, with no page reloads, ads blocking the calculator, or accounts required.
Length Converter
Convert between metres, feet, inches, miles, kilometres and more.
Open toolWeight & Mass Converter
Convert kilograms, pounds, ounces, grams, stones and tonnes instantly.
Open toolTemperature Converter
Convert Celsius, Fahrenheit and Kelvin with accurate formulas.
Open toolSpeed Converter
Convert km/h, mph, m/s, knots and speed of sound (Mach).
Open toolArea Converter
Convert square metres, acres, hectares, square feet and more.
Open toolVolume Converter
Convert litres, gallons, millilitres, cubic metres and cups.
Open toolTime Converter
Convert seconds, minutes, hours, days, weeks, months and years.
Open toolData Storage Converter
Convert bytes, KB, MB, GB, TB and PB using binary or decimal units.
Open toolCurrency Converter
Convert between major world currencies using reference exchange rates.
Open toolPressure Converter
Convert pascal, bar, psi, atmosphere and torr pressure units.
Open toolEnergy Converter
Convert joules, calories, kilowatt-hours, BTU and electron-volts.
Open toolPower Converter
Convert watts, kilowatts, horsepower and BTU per hour.
Open toolAngle Converter
Convert degrees, radians, gradians and full turns.
Open toolFuel Consumption Converter
Convert km/l, miles per gallon (US & UK) and litres per 100 km.
Open toolCooking Measurement Converter
Convert cups, tablespoons, teaspoons, millilitres and grams for recipes.
Open toolShoe Size Converter
Convert shoe sizes between US, UK, EU and centimetre foot length.
Open toolClothing Size Converter
Convert clothing sizes between US, UK, EU and international S-XL labels.
Open toolTypography Unit Converter
Convert pixels, points, em, rem and percent for web and print typography.
Open toolDensity Converter
Convert kg/m³, g/cm³, kg/L, lb/ft³ and lb/gal density units.
Open toolForce Converter
Convert newtons, kilonewtons, pound-force, kilogram-force and dynes.
Open toolTorque Converter
Convert newton-metres, pound-feet, pound-inches and kilogram-force metres.
Open toolFrequency Converter
Convert hertz, kilohertz, megahertz, gigahertz and RPM.
Open toolRing Size Converter
Convert ring size between US sizing, diameter and circumference in millimetres.
Open toolBuilt for speed, accuracy, and privacy
Instant results
Every calculation runs in JavaScript directly in your browser — no waiting on a server round-trip for a simple conversion.
Private by design
Your numbers never leave your device. There's nothing to log, store, or transmit — the conversion happens locally, every time.
Accurate formulas
Every tool uses internationally recognised unit definitions, with clear notes wherever a unit family has regional quirks or approximations.