Length and Area
mtomm
Convert metres (m) to millimetres (mm).
Factor1 m = 1000 mm
Converter
m
Accepts numbers or expressions, e.g. 150 + 14.7
Result
mm
Rendered to 6 significant figures.
Formula
Formula
mm = m × 1000
Multiply any value in metres by 1000 to obtain the value in millimetres.
Worked example
Convert 1 m to mm.
- 01Start with 1 m.
- 02Multiply by the conversion factor: 1 × 1000 = 1000 mm.
Result1 m = 1000 mm
Conversion table
| m | mm |
|---|---|
| 1 | 1000 |
| 2 | 2000 |
| 5 | 5000 |
| 10 | 10000 |
| 20 | 20000 |
| 50 | 50000 |
| 100 | 1.0000e+5 |
| 200 | 2.0000e+5 |
| 500 | 5.0000e+5 |
| 1000 | 1.0000e+6 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from m to mm?
1 m equals 1000 mm. To convert, multiply the value in metres by 1000.
How do I convert 1 m to mm?
1 m = 1000 mm. For any value, multiply by 1000.
How do I convert mm back to m?
Divide by the same factor — or equivalently, multiply by 0.001. So 1 mm = 0.001 m.
When would I need to convert metre to millimetre?
Length conversions appear in piping, layout, and mechanical drawings — particularly when reconciling imperial fittings or instrument lengths with metric plant drawings.
Is the conversion exact?
Yes. Both m and mm are defined by exact SI relationships, so the displayed factor is exact (any rounding shown is only for display).