Compare

Side-by-side comparisons to help you pick the right unit (or scale) for the right job.

All comparisons

Data

KB vs KiB — what's the difference?

A side-by-side look at the decimal (KB) and binary (KiB) interpretations of "kilobyte".

5–7 min Temperature

Celsius vs Kelvin — which temperature scale is "correct"?

Same size, different zero. When to use Kelvin and when Celsius is fine.

5–7 min Volume

US vs UK gallon — they're not the same

Why a US gallon and a UK (imperial) gallon differ by 20%, and how to tell which one you have.

5–7 min Length

Miles vs kilometres — the global distance standoff

Why two units of distance have coexisted for centuries, and which one you should expect to see.

5–7 min Mass

Kilogram vs pound — body weight around the world

One kilogram = how many pounds? Plus the hidden stone unit you meet in the UK.

5–7 min Data

Byte vs bit — the storage-vs-speed divide

A byte is 8 bits. Network speeds are in bits; storage is in bytes. The case matters.

5–7 min Temperature

Celsius vs Fahrenheit — same metric, different zero

Both measure hot/cold; one is taught in school everywhere, the other used in the US for daily life.

5–7 min Energy

Joule vs calorie — kitchen vs classroom

Why food labels use calories (or kilocalories) while physics uses joules.

5–7 min