Unit Converter
Unit converters for everyday and work use: length, mass, temperature, time, area, volume, speed, pressure, power, fuel consumption, and a cooking calculator for converting cups and spoons into grams.
Everything runs right in your browser — instantly, with no data sent anywhere.
Length Converter
Convert length between metric (mm, cm, m, km) and imperial (inch, foot, yard, mile) units.
Mass Converter
Convert mass between milligrams, grams, kilograms, tonnes, ounces, and pounds online.
Temperature Converter
Convert temperature between Celsius, Fahrenheit, and Kelvin online.
Time Unit Converter
Convert time between milliseconds, seconds, minutes, hours, days, and weeks online.
Area Converter
Convert area between square meters, hectares, square kilometers, acres, square feet, and square inches.
Volume Converter
Convert volume between milliliters, liters, cubic meters, gallons, quarts, pints, cups, and fluid ounces (US).
Speed Converter
Convert speed between kilometers per hour, meters per second, miles per hour, knots, and feet per second.
Pressure Converter
Convert pressure between pascals, kilopascals, bar, atmospheres, psi, and millimeters of mercury.
Power Converter
Convert power between watts, kilowatts, megawatts, horsepower, and BTU per hour.
Fuel Economy Converter
Convert fuel economy between liters per 100 km, kilometers per liter, and miles per gallon (US and UK).
Cooking Calculator
How many grams are in a cup of flour or sugar? Convert cups and spoons to grams by ingredient, adjust oven temperature, and res…