Unit Converters

Length, weight, temperature, volume, and cooking conversions between metric and imperial units.

Unit Converter

Convert between metric and imperial units of length, weight, temperature, volume, area, and speed.

Length Converter

Convert between millimeters, centimeters, meters, kilometers, inches, feet, yards, and miles.

Weight Converter

Convert between milligrams, grams, kilograms, metric tons, ounces, pounds, and stones.

Temperature Converter

Convert between Celsius, Fahrenheit, and Kelvin with the exact formulas shown.

Cooking Converter

Convert US kitchen measures — teaspoons, tablespoons, cups, fluid ounces, pints, quarts, gallons, and milliliters.

Height Converter

Convert height between centimeters and feet & inches, with results in every format.

About our unit converters

Every conversion factor on this site is the exact legal definition, not a rounding: the inch is exactly 25.4 millimeters, the pound exactly 453.59237 grams, the US gallon exactly 3.785411784 liters — the values fixed by the 1959 international agreement and maintained by NIST. When precision matters, the difference between 2.2 and 2.20462 pounds per kilogram adds up fast.

The general unit converter handles length, weight, temperature, volume, area, and speed in one tool, while the dedicated converters go deeper on the conversions people actually search for: meters to feet, kilograms to pounds, Celsius to Fahrenheit with reference points from body temperature to oven settings, and a cooking converter that untangles cups, tablespoons, fluid ounces, and milliliters — including the fluid-versus-dry-ounce trap that ruins recipes.

Each converter shows the formula it applied and a table of nearby values, so you get context, not just a number: if 170 cm is 5′7″, you can see at a glance what 165 and 175 are too.