Length, weight, temperature, area, volume, speed, time and digital storage conversion with high-precision results and full unit coverage.
The tools
Ordered by how often they are used. Every one is free and runs in your browser.
Background
Unit conversion is the kind of task that feels too small to think about until it goes wrong. Mixing metric and imperial has destroyed spacecraft, mis-dosed patients and ruined recipes — the arithmetic is trivial, but doing it in your head at speed is how errors creep in.
These converters give you exact factors and full precision, updating live as you type. Every conversion is bidirectional, so you can work in whichever direction suits the problem in front of you.
Coverage spans the everyday units and the awkward ones: nautical miles alongside metres, troy ounces alongside grams, and both decimal and binary interpretations of digital storage — which is why a '500 GB' drive shows up as 465 GB in your operating system.
What people ask most about unit converters and how ours work.
Keep exploring
Groups of tools that people often need alongside these.
