Unit Converter
Length, weight, temperature, volume, and speed — convert between any units instantly.
A single converter for the units people look up every day: metres, feet, kilograms, pounds, Celsius, Fahrenheit, litres, gallons, and more. Pick a category, pick your units, and the result updates as you type.
Units covered
- Length: millimeters, centimeters, meters, kilometers, inches, feet, yards, miles
- Weight: milligrams, grams, kilograms, metric tons, ounces, pounds, stone
- Area: square centimeters, square meters, hectares, square kilometers, square feet, square yards, acres — for a dedicated version see the area converter.
- Volume: milliliters, liters, cups, pints, quarts, gallons, cubic meters
- Speed: meters/second, kilometers/hour, miles/hour, knots
- Temperature: Celsius, Fahrenheit, Kelvin
Frequently asked questions
Does the conversion happen on a server?
No — every conversion runs instantly in your browser using plain JavaScript. Nothing you type is sent anywhere.
How accurate are the results?
Conversions use the internationally defined exact factors (for example, 1 inch = 2.54 cm exactly), so results are accurate to 8 decimal places before rounding for display.
Can I convert in the other direction?
Yes — type into either the "From" or the "To" field and the other side updates automatically, or use the swap button to flip both sides at once.