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.
Loading tool...
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 3.5 km to metres.
- Tell ChatCat your topic
- Get practice questions with solutions
- Ask for hints, judgement-free!
Explore More Maths Tools
Fractions Calculator
Add, subtract, multiply, divide and simplify fractions step by step. Convert between fractions and decimals. Free calculator for GCSE and IGCSE maths.
Percentage Calculator
Calculate percentages of amounts, percentage change, reverse percentages and more. Free percentage calculator for GCSE and IGCSE maths.
Rounding Calculator
Round to decimal places, significant figures, or the nearest 10, 100 or 1000 with clear explanations. Free rounding calculator for GCSE and IGCSE maths.
