Chains & Sprockets
Sprocket Pitch Diameter Calculator
Enter chain pitch and sprocket teeth to calculate the pitch circle diameter through the chain pin centers.
Inputs
Formula
Sprocket pitch circle diameter
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
- Chain pitch
- 12.7 mm
- Sprocket teeth
- 19 teeth
Result
- Pitch circle diameter
- 77.16 mm
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Frequently asked questions
What is sprocket pitch diameter?
It is the diameter of the pitch circle passing through the roller-chain pin centers as the chain wraps around the sprocket.
Is pitch diameter the same as outside diameter?
No. Outside diameter depends on sprocket tooth form and is larger than or otherwise different from the pitch circle diameter.