Module to circular pitch
Type a value in m to get it in CP (mm) instantly.
31.42CP (mm)
That's 1.67× as coarse as a truck final drive, while a rolling mill gear is 2× coarser. A 20-tooth gear of this size would be 200 mm across.
Convert the other way: CP (mm) to m
What it means
How big are those teeth?
Module and pitch describe tooth size only. Gears also need the same pressure angle, usually 20°, before they will run together.
The math
How to convert m to CP (mm)
To convert module to circular pitch, multiply by 3.14159.
Example: 10 m × 3.14159 = 31.4159 CP (mm).
In the other direction, 1 CP (mm) = 0.31831 m.
Every unit
Your tooth size in every unit
Tables
m to CP (mm) conversion table
| m | CP (mm) |
|---|---|
| 0.5 m | 1.5708 CP (mm) |
| 0.8 m | 2.51327 CP (mm) |
| 1 m | 3.14159 CP (mm) |
| 1.25 m | 3.92699 CP (mm) |
| 1.5 m | 4.71239 CP (mm) |
| 2 m | 6.28319 CP (mm) |
| 2.5 m | 7.85398 CP (mm) |
| 3 m | 9.42478 CP (mm) |
| 4 m | 12.5664 CP (mm) |
| 5 m | 15.708 CP (mm) |
| 6 m | 18.8496 CP (mm) |
| 8 m | 25.1327 CP (mm) |
| 10 m | 31.4159 CP (mm) |
CP (mm) to m conversion table
| CP (mm) | m |
|---|---|
| 0.5 CP (mm) | 0.159155 m |
| 0.8 CP (mm) | 0.254648 m |
| 1 CP (mm) | 0.31831 m |
| 1.25 CP (mm) | 0.397887 m |
| 1.5 CP (mm) | 0.477465 m |
| 2 CP (mm) | 0.63662 m |
| 2.5 CP (mm) | 0.795775 m |
| 3 CP (mm) | 0.95493 m |
| 4 CP (mm) | 1.27324 m |
| 5 CP (mm) | 1.59155 m |
| 6 CP (mm) | 1.90986 m |
| 8 CP (mm) | 2.54648 m |
| 10 CP (mm) | 3.1831 m |
Quick answers
Quick answers
- How many CP (mm) is 1 m?
- 1 m is 3.14159 CP (mm).
- How many CP (mm) is 10 m?
- 10 m is 31.4159 CP (mm).
The units
About these units
Module (m)
Millimeters of pitch diameter per tooth, the metric standard.
Circular pitch (CP (mm))
The distance from one tooth to the next around the pitch circle.
Keep going