Step by step
- Count how many steps of 10 separate the units.
- Smaller unit: multiply; bigger unit: divide.
- Move the decimal point that many places.
At a glance
| From | To | Do |
|---|---|---|
| mm | cm | ÷ 10 |
| cm | m | ÷ 100 |
| m | km | ÷ 1,000 |
| m | mm | × 1,000 |
Related questions
How many mm in a meter?
1,000.
Is a decimeter used?
Rarely; 1 dm = 10 cm.
Do the same prefixes apply to weight?
Yes: 1 kg = 1,000 g and 1 g = 1,000 mg.
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Updated November 14, 2026.