Gears
Gear Center Distance Calculator
Enter a common module and both tooth counts to calculate the standard center distance between two external spur gears.
Inputs
Formula
Standard external spur-gear center distance
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
- Common module
- 2 mm
- Gear 1 teeth
- 20 teeth
- Gear 2 teeth
- 40 teeth
Result
- Standard center distance
- 60 mm
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Continue your workflow with a related calculation.
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Find the metric module that matches a measured or specified spur-gear reference diameter and tooth count.
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Calculate ideal external gear ratio from driver and driven gear tooth counts.
Technical references for this calculation
Frequently asked questions
Does this apply to profile-shifted gears?
Not directly. Profile shift can change working center distance, so use the appropriate gear-design equations for shifted gears.
Can the two gears have different modules?
A standard meshing spur-gear pair uses compatible tooth pitch, typically the same module and pressure angle.