Unit Converter

About this tool

Convert between common length, weight, and temperature units. Pick a category, choose your "from" and "to" units, and the result updates as you type. Use "Swap units" to flip the conversion direction instantly.

Frequently asked questions

Which units are supported?

Length: millimeters, centimeters, meters, kilometers, inches, feet, yards, and miles. Weight: milligrams, grams, kilograms, ounces, and pounds. Temperature: Celsius, Fahrenheit, and Kelvin.

Why does temperature work differently?

Unlike length and weight, temperature scales aren't simple multiples of each other (0°C isn't 0°F), so the tool uses the correct formula for each pair rather than a single conversion factor.

Can I convert Kelvin below zero?

No — Kelvin has an absolute zero, so values below 0K are rejected as physically invalid.