Convert any unit in a second
Length, weight, temperature, volume, area and speed — all conversions run right in your browser. Nothing is sent to a server.
Everything you need from a converter
Six categories, dozens of units, instant results. No sign-up, no tracking, no limits.
Six categories
Length, weight, temperature, volume, area and speed — the conversions people actually need.
Runs offline
All maths happens in your browser. The converter keeps working when the connection drops.
Nothing stored
No accounts, no cookies for tracking, no history of what you typed.
Precise output
Results are shown with up to eight significant digits and rounded sensibly.
Frequently asked
Short answers to the questions we get most often.
How accurate are the conversions?
Every unit is defined by an exact factor against its base unit (metre, kilogram, litre and so on). Results are computed in double precision, so the accuracy is far beyond what you need for everyday work.
Is the site free?
Yes. There is no paid tier, no registration and no limit on the number of conversions.
Do you store the values I enter?
No. The conversion runs entirely in your browser — the numbers never leave your device.
Why is the page in English?
The tool is meant for international use, so English is the common language. The units themselves are the same everywhere.
Can I use it on a phone?
Yes. The layout adapts to any screen, and the page works in every modern browser without an app.