Unit converters
Unit converters for length, weight, volume, temperature, pressure, energy, data, currency, cooking, and shoe, ring and clothing sizes.
- 26 calculators
- Free, no sign-up
- Instant results
Length, weight & more
Length, weight, area, volume, speed, data and currency.
Unit converterLength, weight, temperature, volume, area, speed, time, pressure, energy, data, fuel economy and more.Open calculator Pounds to kg converterPounds to kilograms and back, with stone and pounds, ounces, both-way tables, luggage and gym examples, and batch convert.Open calculator Ounces to grams converterOunces to grams and back, with pounds and ounces, troy ounces for gold and silver, carats, fluid ounce notes, tables and batch convert.Open calculator Miles to km converterMiles to kilometres and back, with nautical miles, feet and metres, race distances and paces, mph to km/h, tables and batch convert.Open calculator Inches to cm converterInches to centimetres and back, feet and inches, mm and metres, fractions from 1/2 to 1/64, screen, height and paper sizes, and charts.Open calculator Feet to meters converterFeet to metres and back, feet and inches, yards, heights, room sizes, altitudes and flight levels, with charts and batch convert.Open calculator Area converterSquare feet to square metres and back, plus acres, hectares, sq yd, sq mi, km² and Indian land units like bigha, gaj, marla, kanal, cent and guntha.Open calculator Volume converterLitres to US or UK gallons and back, plus quarts, pints, cups, fl oz, spoons, ml, cubic metres, cubic feet and oil barrels.Open calculator Speed convertermph to km/h and back, plus knots, m/s, ft/s, Mach and running pace in minutes per km or mile.Open calculator Angle converterDegrees, radians (as π/6 and so on), gradians, DMS, turns, arcminutes, arcseconds and mils, plus compass bearings, slope % and clock-hand angles.Open calculator Torque converterN·m to lb·ft and back, plus lb·in, oz·in, kgf·m, kg·cm, N·cm, dyn·cm and more, with typical wheel nut and bike bolt torques, force × spanner length and torque ↔ power at any rpm.Open calculator Flow rate converterL/min to gpm and back, plus m³/h, L/s, cfm, cfs, UK gallons, barrels a day and acre-feet, with pipe flow from diameter and speed, time to fill a tank and mass flow.Open calculator Density converterkg/m³ to g/cm³ and lb/ft³ and back, plus g/mL, kg/L, lb/in³, lb/gal, oz/in³, slug/ft³, specific gravity, API gravity and Baumé, with typical densities and mass ↔ volume.Open calculator Data storage converterMB, GB and TB in decimal (1000) or binary (1024: MiB, GiB, TiB), bits and bytes, why 1 TB shows 931 GB, and download time.Open calculator Currency converterConvert at today’s ECB rates, see what you really get after bank and card margins and fees, several currencies at once and a quick table.Open calculator
Temperature, pressure & energy
Celsius and Fahrenheit, psi and bar, kWh and BTU, watts and horsepower.
Celsius to Fahrenheit converter°C to °F and °F to °C with the sum in your numbers, body, fever, weather and oven temperatures, gas marks, Kelvin, Rankine and charts.Open calculator Pressure converterpsi to bar, bar to psi, kPa, hPa, mbar, atm, mmHg, inHg and kg/cm², for tyres, weather, blood pressure and altimeters, with gauge ↔ absolute.Open calculator Energy converterBTU to kWh, kWh to BTU, joules, kJ, MJ, calories, food kcal, Wh and therms, with AC tons and a power × time helper.Open calculator Power converterWatts, kW, MW, mechanical, metric (PS), electrical and boiler horsepower, BTU/h, AC tons, kcal/h and dBm, with energy cost over time and kW from volts and amps.Open calculator
Cooking & baking
Cups to grams, scaling recipes, cake tins and oven temperatures.
Cups to grams converterCups, spoons and ml to grams, ounces and back for 70+ baking ingredients, with US, metric and UK cups, a recipe scaler and oven temperatures with gas marks.Open calculator Recipe scalerPaste a recipe and scale it by servings, a multiplier, the one ingredient you have or your pan size, with kitchen fractions, egg tips and metric or US units.Open calculator Baking pan size converterScale a recipe to a different cake tin: round, square, loaf or bundt pans in inches or cm, by area or volume, with the ingredient multiplier and egg tips.Open calculator Oven temperature converterOven °C to °F and back, fan oven and gas mark settings, kitchen rounding, traditional terms like moderate and hot, an air fryer helper and sugar stages.Open calculator
Shoe, ring & clothing sizes
Sizes between US, UK, EU and other systems.
Shoe size converterUS, UK, EU, Mondopoint, Japan, Korea/China and Australia shoe sizes for men, women and kids, from any size or your foot length in cm or inches, with toe room and a full chart.Open calculator Ring size converterUS, UK letter, ISO/EU, Japan, Swiss and India ring sizes from any size, inside diameter or circumference, a string around your finger with knuckle allowance, and a true-size ring on screen you can calibrate with a bank card.Open calculator Clothing size converterWomen’s dresses, tops and trousers, men’s suits, shirts and trousers, and kids’ sizes between US, UK, EU, France, Italy, Japan, China, Australia and S–XL, or find your size from bust, chest, waist, hips and height.Open calculator
About the unit converters
Convert anything in one place: the unit converter covers length, weight, volume, area, speed, pressure, energy and data, and the quick converters do the common jobs in one step, like pounds to kg, miles to km, inches to cm and Celsius to Fahrenheit. Every one works both ways and shows the sum it used.
In the kitchen, turn cups into grams for 70+ ingredients, scale a recipe, swap to a different cake tin and convert oven temperatures and gas marks. For shopping abroad there are shoe, ring and clothing size charts and a live currency converter.
Conversion factors are the exact defined values where one exists (1 inch is exactly 2.54 cm, 1 lb is exactly 0.45359237 kg), so the answers are as precise as the numbers you type.