Unit Converter
Convert length, weight, temperature, area, volume, speed, data size and time instantly.
Your files never leave your device
- Private: runs in your browser
- Free, with no daily limits
- No sign-up, no watermark
- Works offline once loaded
How to use Unit Converter
- 1Pick a category such as length or weight.
- 2Type a value and choose the two units.
- 3Read the answer — or the full table of every unit.
Why use this unit converter
- 8 categories, 70+ units
- Swap units in one tap
- Full conversion table
- Copy any result
Most online tools upload your file to their server, process it there and then make you pay to remove limits. This one does the work inside your browser tab instead — so it is faster, it is free for us to run, and your document stays with you.
Questions about Unit Converter
How accurate are the conversions?
We use the exact definitions (for example 1 inch = 2.54 cm, 1 lb = 0.45359237 kg) and show up to 8 significant figures.
More daily tools
See allPassword GeneratorStrong passwords, passphrases and PINs from Web Crypto.Password Strength CheckerSee how long a password would take to crack, and why.Date CalculatorAge, days between dates, add or subtract days, countdowns.BMI & Health CalculatorBMI, daily calories, water intake and healthy weight range.