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Convert units

Nine categories, exact factors, instant results.

Ready. Free

01 — Steps

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.

02 — 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.

04 — More