Standard Spur Gear Size
Compute pitch, addendum, base diameters, centre distance, circular & base pitch, ratio, recommended face width and whole depth for standard spur gears.
Inputs
Formula
d=mZ; da=d+2m; df=d−2.5m; db=d·cosα; a=m(Z1+Z2)/2; p=πm; pb=πm·cosα; h=2.25m
How to use
- Fill in Module m, Pinion teeth Z₁, Gear teeth Z₂, Pressure angle α in the Inputs section (watch the unit on each field).
- Click Calculate; the tool evaluates the formula shown above.
- Read Pinion pitch d₁, Pinion addendum da₁, Pinion base db₁, Centre distance a, Circular pitch p, Base pitch pb in the results area.
Formula notesStandard gear: pitch dia d = m·z, tooth thickness s = π·m/2, center dist a = m(z1+z2)/2.