M to mm
One m equals 1000 mm. Type any number and the answer appears as you type — the maths happens in your browser.
Result
The same value in every unit
| Unit | Value |
|---|
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Common values
| m | mm |
|---|---|
| 1 m | 1000 mm |
| 2 m | 2000 mm |
| 3 m | 3000 mm |
| 5 m | 5000 mm |
| 10 m | 10000 mm |
| 15 m | 15000 mm |
| 20 m | 20000 mm |
| 25 m | 25000 mm |
| 50 m | 50000 mm |
| 100 m | 100000 mm |
| 500 m | 500000 mm |
| 1000 m | 1000000 mm |
How to use
- Enter the number of m in the field.
- The result in mm updates on every keystroke.
- Use the table below for the values people look up most often.
Formula and reverse conversion
The formula
To convert by hand: mm = m × 1000. Going back the other way, one mm is 0.001 m.
Metric units differ by powers of ten
Both units belong to the metric system, so the conversion is a shift of the decimal point: the factor is a power of ten and nothing is lost to rounding.
mm = m × 1000
Frequently asked questions
How many mm are in one m?
One m is 1000 mm.
How do I convert m to mm?
Multiply by the factor: mm = m × 1000.
Is the result exact?
The factors are the exact legal definitions, and up to ten significant digits are kept in the answer. Rounding happens only in the display.
How do I convert mm back to m?
One mm is 0.001 m — or open the reverse page linked below.