Gear Pitch Calculator
SI
Imp
Imperial
Inputs
View results
Known pitch
Choose which gear tooth-size value you know.
Module (mm)
Diametral pitch (1/in)
Circular pitch (mm)
Pitch value
(p)
Module in mm, diametral pitch in 1/in, or circular pitch in mm.
mm
Number of teeth
(z)
Tooth count, used to calculate pitch diameter.
Results
Default result
Edit inputs
Module
(m)
2
mm
Also computed
Diametral pitch
(DP)
12.7
1/in
Circular pitch
(p)
6.283
mm
Pitch diameter
(d)
40
mm
Addendum
2
mm
Whole depth
4.5
mm
Method notes
3 notes
Circular pitch p = π·m; diametral pitch DP = 25.4 / m.
Pitch diameter d = m·z for module m and tooth count z.
Mating gears must share pitch system and pressure angle.
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