Chrae Lab

Unit converter

Free online unit converter for length, weight, volume, area, speed and temperature. Convert metric to imperial and back instantly — runs entirely in your browser.

This tool needs JavaScript to run. Nothing is sent to a server — it works entirely in your browser. The code is open source: view it on GitHub.

About Unit converter

A fast online unit converter for everyday measurements. Pick a category, type a value, and the result updates as you type — no page reloads, no ads, nothing sent to a server.

  • Six categories: length, weight and mass, volume, area, speed and temperature.
  • Metric and imperial units side by side — metres to feet, kilograms to pounds, litres to gallons, Celsius to Fahrenheit and more.
  • Swap the from and to units with one click and see the conversion both ways.
  • Remembers your last category and units on this device.

Frequently asked questions

How do I convert metric to imperial units?

Choose a category such as length or weight, pick the unit you have (for example metres) and the unit you want (for example feet), then type the value. The converted result appears instantly and updates as you type.

Which units does the converter support?

Length (millimetres to miles), weight and mass (grams to tons), volume (millilitres to gallons), area (square metres to acres), speed (km/h, mph, m/s, knots) and temperature (Celsius, Fahrenheit, Kelvin).

How accurate are the conversions?

Every unit is defined against an exact base unit using published conversion factors, so results are as precise as the numbers you enter. Results are rounded for display but computed at full precision.

Is the unit converter free and private?

Yes. It is free, has no ads or account, and the conversion happens entirely in your browser. Your last-used units are kept in your browser storage only.