Weight, temperature, volume, speed, length, data storage and other unit converters — every one free and instant, for students, travelers, cooks and developers alike.
Convert between metric and imperial length units instantly.
Open calculator →Free angle converter. Convert between degrees, radians and gradians.
LiveFree area converter. Convert between square meters, square feet, acres, hectares and more.
LiveFree number base converter between binary, decimal and hexadecimal — useful for students and programmers.
LiveApproximate clothing size converter between US, UK and EU sizing systems for women's apparel.
LiveFree kitchen measurement converter. Convert between cups, tablespoons, teaspoons, milliliters and fluid ounces for recipes.
LiveCurrency converter demo using example fixed rates. Replace with a live FX API (e.g. exchangerate-api.com) for real accuracy.
LiveFree digital storage converter. Convert between bits, bytes, KB, MB, GB and TB (decimal/SI units).
LiveFree energy converter. Convert between joules, kilocalories, kilowatt-hours and BTU.
LiveFree fuel economy converter. Convert between km/liter and miles-per-gallon (US). Note: L/100km is an inverse measure — for exact L/100km conversion use 235.215/mpg or 100/(km_per_l).
LiveFree power converter. Convert between watts, kilowatts and horsepower.
LiveFree pressure converter. Convert between pascals, bar, PSI and atmospheres.
LiveFree Roman numeral converter — convert any number (1-3999) to Roman numerals, or a Roman numeral back to a number.
LiveApproximate shoe size converter between US, UK, EU sizing and foot length in centimeters.
LiveFree speed converter. Convert between km/h, mph, m/s and knots.
LiveFree temperature converter between Celsius, Fahrenheit and Kelvin, with the formula shown.
LiveFree time converter. Convert between seconds, minutes, hours, days, weeks, months and years.
LiveFree volume converter. Convert between liters, milliliters, gallons, quarts, pints, cups and fluid ounces.
LiveFree weight converter. Convert between kilograms, grams, pounds, ounces, stone and metric tons.
Yes — standard unit conversions (length, weight, volume, temperature, etc.) use fixed, internationally-defined conversion factors, so results are exact, not estimates.
The Fuel Economy Converter here converts between km/liter and mpg for a figure you already have; the Fuel Efficiency Calculator (under Automotive) calculates your MPG/km-per-liter from a trip's distance and fuel used.