Spur Gear Calculator
Enter the module and the number of teeth to get the sizes of a spur gear pair: pitch, tip and root diameters, centre distance and contact ratio. Add profile shift to change the centre distance or avoid undercut, and a torque to see the tooth forces.
Results
- Gear ratio
- Centre distance
- Working pressure angle
- Contact ratio
- Circular pitch
- Whole depth of tooth
Sizes of each gear, mm
| Size | Pinion | Gear |
|---|
Forces and speeds
Sizes are for involute spur gears with a standard full-depth rack (addendum 1 m, dedendum 1.25 m). Tip diameters keep the standard 0.25 m root clearance when the gears are profile shifted. Gear tooth strength is not checked here.