Pulley Speed Ratio Calculator
Choose diameter or tooth-count mode, then enter both pulley values and the input speed.
Speed ratio (driver ÷ driven):
Ideal output speed:
Ideal no-slip geometry only. This does not infer load, torque, belt selection, mechanical safety, or real-world losses.
Inputs stay in this browser; nothing is sent.
A QUICK WALKTHROUGH
How to use this tool
- Input mode
- Driver pulley
- Calculate
Ideal no-slip geometry only. This does not infer load, torque, belt selection, mechanical safety, or real-world losses.
Ideal no-slip geometry only. This does not infer load, torque, belt selection, mechanical safety, or real-world losses.
Inputs stay in this browser; nothing is sent.
Inputs stay in this browser; nothing is sent.
GOOD TO KNOW
Common questions
Pulley Speed Ratio Calculator
Ideal no-slip geometry only. This does not infer load, torque, belt selection, mechanical safety, or real-world losses.