Convert between units of length, weight, temperature, volume, and more online for free. Instant, accurate unit conversion tool. No signup required.
First time here? Select the unit category (length, weight, etc.) Your input is processed locally and disappears when you close the tab.
Stop hunting for conversion formulas every time you need to switch units. Our free Unit Converter online covers eight measurement categories — length, weight, temperature, area, volume, speed, time, and digital data — and updates the result the instant you type.
Use it as an everyday measurement converter for recipes, travel, DIY projects, science homework, or engineering work. Convert metric to imperial and US customary units side by side, flip the direction with a single swap button, and open 'Convert to all units' to see every equivalent in a category at once. As a length converter it moves between meters, miles, feet, and inches; as a temperature converter it handles Celsius, Fahrenheit, and Kelvin with the correct offset math — all with up to ten decimal places of precision.
Every conversion is computed locally in your browser from exact conversion factors, so nothing you enter is ever transmitted or logged. Pair it with our other utilities whenever you need them: the Age Calculator for precise date differences, the Reading Time Calculator for estimating how long content takes to read, or the Random Number Generator for quick, secure random values.
Select the unit category (length, weight, etc.)
Enter the value to convert
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