Belts & Pulleys
Belt Speed Calculator
Enter pulley diameter and RPM to calculate the ideal linear speed at the pulley pitch line.
Inputs
Formula
Belt linear speed
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
- Pulley diameter
- 150 mm
- Pulley speed
- 1,450 rpm
Result
- Belt speed
- 11.39 m/s
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Calculate belt-drive speed ratio from driver and driven pulley diameters.
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Calculate approximate open-belt length from pulley diameters and center distance, with metric and imperial results.
Frequently asked questions
What diameter should I enter?
For engineering calculations, use the effective or pitch diameter used by your belt system rather than mixing diameter definitions.
Does the result account for slip?
No. It is the theoretical surface or pitch-line speed from diameter and RPM.