Gear Pitch Calculator

Inputs

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Choose which gear tooth-size value you know.

Module in mm, diametral pitch in 1/in, or circular pitch in mm.

mm

Tooth count, used to calculate pitch diameter.

Results

Default result
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Module(m)
2

mm

Also computed

Diametral pitch(DP)12.7

1/in

Circular pitch(p)6.283mm

Pitch diameter(d)40mm

Addendum2mm

Whole depth4.5mm

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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