Unit Converter
Convert between metric and imperial units for length, mass, volume and more. Free unit converter with step-by-step working for GCSE and IGCSE maths.
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Unit Conversions
Everything you need to learn unit conversions, broken down into simple, bite-sized cards.
1. Metric Length
Metric length units go mm → cm → m → km, each linked by a power of 10. Converting to a bigger unit? Divide. To a smaller unit? Multiply.
| Conversion | Factor |
|---|---|
| mm → cm | ÷ 10 |
| cm → m | ÷ 100 |
| m → km | ÷ 1000 |
2. Mass Units
Metric mass units go mg → g → kg → t, each linked by a factor of 1000. Converting to a bigger unit? Divide. To a smaller unit? Multiply.
| Conversion | Factor |
|---|---|
| mg → g | ÷ 1000 |
| g → kg | ÷ 1000 |
| kg → t | ÷ 1000 |
3. Time Units
Time is not metric, as it uses 60 and 24 instead of powers of 10. Learn the key conversions:
4. Area Units
Area is measured in square units. When converting, square the length factor.
5. Volume Units
Volume is measured in cubic units. When converting, cube the length factor.
Test Your Understanding
Try a quick question with ChatCat, your AI maths study buddy.
Hi! I'm ChatCat. What topic would you like to practise today?
Here's one for you! Have a go.
Convert to metres.
Correct!
, so m.
Not quite right
To convert km to m, multiply by 1000. So m.
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