Module to diametral pitch
Type a value in m to get it in DP instantly.
2.54DP
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: DP 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 DP
Module and diametral pitch are reciprocals through the inch: module = 25.4 ÷ DP. Circular pitch follows as CP = π × module.
Example: 10 m = 2.54 DP.
Every unit
Your tooth size in every unit
Tables
m to DP conversion table
| m | DP |
|---|---|
| 0.5 m | 50.8 DP |
| 0.8 m | 31.75 DP |
| 1 m | 25.4 DP |
| 1.25 m | 20.32 DP |
| 1.5 m | 16.9333 DP |
| 2 m | 12.7 DP |
| 2.5 m | 10.16 DP |
| 3 m | 8.46667 DP |
| 4 m | 6.35 DP |
| 5 m | 5.08 DP |
| 6 m | 4.23333 DP |
| 8 m | 3.175 DP |
| 10 m | 2.54 DP |
DP to m conversion table
| DP | m |
|---|---|
| 0.5 DP | 50.8 m |
| 0.8 DP | 31.75 m |
| 1 DP | 25.4 m |
| 1.25 DP | 20.32 m |
| 1.5 DP | 16.9333 m |
| 2 DP | 12.7 m |
| 2.5 DP | 10.16 m |
| 3 DP | 8.46667 m |
| 4 DP | 6.35 m |
| 5 DP | 5.08 m |
| 6 DP | 4.23333 m |
| 8 DP | 3.175 m |
| 10 DP | 2.54 m |
Quick answers
Quick answers
- How many DP is 1 m?
- 1 m is 25.4 DP.
- How many DP is 10 m?
- 10 m is 2.54 DP.
The units
About these units
Module (m)
Millimeters of pitch diameter per tooth, the metric standard.
Diametral pitch (DP)
Teeth per inch of pitch diameter, the US standard. Bigger means finer.
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