Gears
Gear Module Calculator
Use this when reverse-checking an existing gear: enter its reference diameter and whole tooth count to recover the module value that defines tooth size.
Inputs
Formula
Metric gear module
Worked example
Using the default values shown in the calculator, the same formula gives the following result. This is a quick sanity check for the calculation, not a design recommendation.
Inputs
- Reference diameter
- 60 mm
- Number of teeth
- 30 teeth
Result
- Calculated module
- 2 mm
Related calculators
Continue your workflow with a related calculation.
Gears
Gear Pitch Diameter Calculator
Calculate standard metric spur-gear reference diameter from module and number of teeth.
Gears
Gear Circular Pitch Calculator
Calculate circular pitch for a metric gear from module using the standard pi-times-module relationship.
Gears
Gear Center Distance Calculator
Calculate center distance for two standard external spur gears from module and tooth counts.
Technical references for this calculation
Frequently asked questions
What does module represent?
Module is reference diameter divided by tooth count and is a common metric measure of gear tooth size.
Do mating gears need the same module?
Standard mating spur gears use compatible module and pressure-angle geometry so their tooth spacing meshes correctly.