Gear Module & Center Distance Calculator
Calculate pitch diameter d, tip diameter da, root diameter df, and standard center distance a for spur and helical gears.
Min teeth for standard spur without undercutting: zmin = 17
Results
| Gear Ratio i (z2 / z1) | — |
| Standard Center Distance a | — mm |
| Pinion Pitch d1 / Tip da1 | — mm / — mm |
| Gear Pitch d2 / Tip da2 | — mm / — mm |
| Tooth Depth h (2.25m) | — mm |
| Undercut Risk Check | — |
Spur Gear Formulas
Pitch Dia: d = m × z
Center Distance: a = m × (z1 + z2) / 2
Tip Dia: da = d + 2m
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