Sprocket Calculator – Calculate Your Gear Ratios Effortlessly

Use this sprocket calculator tool to quickly determine the optimal size and number of teeth for your sprocket needs.

How to Use the Sprocket Calculator

Simply enter the number of teeth and the pitch diameter in inches for the sprocket you are analyzing. Press the “Calculate” button to see the circumference of the sprocket. Your result will be displayed in the “Result” field.

How the Calculator Works

This calculator multiplies the number of teeth by the pitch diameter and then by Pi (π) to derive the circumference of the sprocket. The circumference is an estimation of the distance one revolution of the sprocket will travel.


The calculator assumes a perfect geometric shape and does not account for manufacturing tolerances, sprocket wear, or chain slack. It is designed for a quick estimation rather than precision engineering purposes. Ensure that your inputs are accurate and that you understand the limitations of such calculations when used in real-world applications.

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