TOOLFree online unit converters
Everyday conversions shouldn't need a search-and-scroll through someone else's cluttered page. This category collects fast, accurate converters for the measurements people look up most — length, weight, temperature, data storage and speed — each with a clean interface, a live result, and the exact conversion rate shown alongside.
Every converter runs entirely in your browser using internationally defined conversion factors, so the answers are precise and instant. More converters are on the way.
Metric vs imperial, handled for you
Most conversion headaches come down to two systems living side by side. The metric system (metres, grams, litres, Celsius) is used by most of the world and scales in tidy powers of ten. The imperial and US customary systems (feet, pounds, Fahrenheit) remain in daily use in the United States and, for some measures, the UK. When a recipe, product spec, road sign or medical reading is quoted in the "other" system, you need a quick, reliable bridge — that's what these tools are for.
Which converter do you need?
- Length — mm, cm, m, km ↔ inches, feet, yards, miles. Heights, distances, DIY and travel.
- Weight — grams and kilograms ↔ ounces, pounds and stone. Body weight, cooking and shipping.
- Temperature — Celsius, Fahrenheit and Kelvin, with the offset handled for you.
- Speed — m/s, km/h, mph and knots. Driving abroad, running and wind speed.
- Area — square metres and feet, acres and hectares. Property, land and flooring.
- Data storage — bytes, KB, MB, GB and TB for files and drives.
Working with measurements for a project? You may also want the everyday calculators and, for running, the pace calculator.