10 calculatorsMetric, US, and more
Unit Converters
Unit converters switch between US customary units and the metric units used almost everywhere else: inches and centimeters, pounds and kilograms, gallons and liters, square feet and square meters, Fahrenheit and Celsius, mph and km/h, horsepower and watts. There are also converters for binary numbers and Roman numerals. Each one shows the exact factor or formula it applies, so you can check or round the result.
- Power Converter Power converter for watts, kW, MW, horsepower, metric PS, BTU/h, kcal/h, ft·lbf/s, cal/s and refrigeration tons, with a table of every unit at once.
- Weight Converter Weight converter for pounds, kilograms, ounces, grams, stone, short and long tons, carats, troy ounces and grains, with every unit shown in one table.
- Unit Converter Unit converter for length, mass, volume, area, speed, time, pressure, energy, data storage and temperature: US and metric units with exact factors.
- Volume Converter Volume converter for cups, tablespoons, teaspoons, fluid ounces, pints, quarts, US and imperial gallons, liters, mL, cubic feet and oil barrels.
- Temperature Converter Temperature converter for Fahrenheit, Celsius, kelvin and Rankine, with the formula used, an oven temperature chart and safe cooking temperatures in °C.
- Area Converter Area converter for square feet, square meters, acres, hectares, square yards, square inches and square miles, with every unit shown in one table at once.
- Length Converter Length converter for inches, feet, yards, miles, centimeters, meters and kilometers, plus mils, furlongs and nautical miles, with all units in one table.
- Speed Converter Speed converter for mph, km/h, knots, m/s, ft/s, Mach and the speed of light, using exact NIST factors, with every unit at once and running pace per mile.
- Roman Numeral Converter Roman numeral converter: turn numbers and years into Roman numerals and back, with a place-value breakdown, strict checking and bar notation to 3,999,999.
- Binary Converter Binary converter for decimal, hex, octal and any base from 2 to 36, with 8- to 64-bit two's complement and text to binary in UTF-8 plus binary to text.