Pulley Calculator - Centers RPM Belt Length and Speed
Gap Small Pulleys May Touch
Enter Large and Small Pulley Diameters and Pulley Center Distance.
Select RPM Large or RPM Small and enter RPM to calculate corresponding pulley RPM.
Drag sliders to animate diagrams.
If you know any 3 values (Pulley sizes or RPM) and need to calculate the 4th, enter the 3 known values and hit Calculate to find the missing value.
For example, if your small pulley is 6" diameter, and spins at 1000 RPM, and you need to find the second pulley size to spin it at 500 RPM,
Enter Pulley1 Size 6, Pulley 1 RPM 1000, Pulley 2 RPM 500, and hit Calculate to find the second pulley diameter.
Enter inches as decimal or fraction with space or slash. eg: 6.75 or 6 3/4 or 6 3 4
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ALWAYS CHECK WITH YOUR LOCAL BUILDING AUTHORITY BEFORE LAYING OUT OR BUILDING ANYTHING AND FOLLOW ALL LOCAL CODES. VERIFY ALL DIMENSIONS AND ANGLES BEFORE CONSTRUCTION.
All calculators on this site are GEOMETRIC only. Check local regulations for sizes, spacings and all engineering requirements.