Mechanical
Belt & Pulley Calculator
Find pulley ratio and output speed from diameters or timing-belt tooth counts.
CALCULATOR
Enter values
USAGE
How to use it
- Choose diameter or timing-belt tooth mode.
- Enter driver and driven values.
- Read output speed from input RPM.
FORMULA
Calculation
i = Ddriven/Ddriver; nout = nin/iExample
20-tooth driver, 60-tooth driven, 1200 RPM input = 400 RPM
TECHNICAL
Technical notes
- Slip and belt compliance are not included.