Gear Center Distance Calculator

How Do You Find the Distance Between Two Gears?

This calculator provides the ideal distance between two the centers of two external spur gears. This is useful when mounting gears to shafts to know how far apart the shafts should be.

What happens when gears are too close or too far apart?

Placing gears closer than the ideal distance will likely result in binding and may lead to failure of the gear. Increasing this distance, and placing gears further apart will result in increased backlash.


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For a quick measurement of your gear across a fixed number of gear teeth, you can use our Gear Span Measurement Calculator and a set of calipers to find these measurements. Whether for workholding or as a quick go-no-go gauge, using a Pitch Plate Calculator can help you design a pitch plate for the gears in your shop.

Here's a Quick Summary:

› Input gear parameters

› Select which gears share the same shaft

› Output final gear ratio