Pitch Diameter Calculator

Inputs

Known pitch

Choose module, diametral pitch or circular pitch.

Pitch value (m)

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

mm

Number of teeth (z)

Gear tooth count.

Results

Default result

Pitch diameter(d)

40mm

Also computed

Module(m)2

mm

Diametral pitch(DP)12.7

1/in

Circular pitch(p)6.283mm

Addendum2mm

Whole depth4.5mm

Method notes 3 notes

Pitch diameter is the theoretical rolling circle of the gear, not the outside diameter.
For module gears, d = m·z. For diametral pitch gears, d(in) = z / DP.
Standard full-depth outside diameter is approximately d + 2m.

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