Convert Between Different Gear Pitch Types

The following are the basic formulas for convert from diametral pitch, ciurcular pitch and module pitches.

 

D = Diametral Pitch         C = Circular Pitch            M = Module

You Have

You Need

Rule

Formula

Diametral Pitch

Circular Pitch

Divide Pi (3.1416) by the diametral pitch

C = 3.1416 / D

 

Module

Divide 25.4 by the diametral pitch

M = 25.4 / D

 

 

 

 

Circular Pitch

Diametral Pitch

Divide Pi (3.1416) by the circular pitch

D = 3.1416 / C

 

Module

Multiply the circular pitch by 8.08505

M = C x 8.08505

 

 

 

 

Module

Diametral Pitch

Module divided by 25.4

D =  25.40 / M

 

Circular Pitch

Module divided by 8.08505

C = M / 8.08505

 

 

 


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