Convert units
Nine categories, exact factors, instant results, offline.
Runs on your device — never uploaded
How to convert units
- Pick a category
Length, mass, temperature, volume, area, speed, time, data or energy.
- Enter a value
Choose from and to units; the answer updates live.
- Swap
One click reverses the direction.
Frequently asked questions
Are the factors exact?
Yes, defined from SI. For example 1 inch = 25.4 mm exactly, 1 lb = 0.45359237 kg exactly.
Is a kilobyte 1000 or 1024 bytes?
Both are available: KB (1000) and KiB (1024).
Does it work offline?
Yes, once the page has loaded.