Mechanical
Gear Ratio Calculator
Calculate ratio, output speed and theoretical torque for single or multi-stage gear trains.
CALCULATOR
Enter values
USAGE
How to use it
- Enter driver and driven tooth counts for each stage.
- Add input RPM and optional torque.
- Add stages to obtain the total ratio.
FORMULA
Calculation
i = Zdriven/Zdriver; nout = nin/i; Tout = Tin×iExample
20-tooth driver and 60-tooth driven gear gives 3:1
TECHNICAL
Technical notes
- Torque output is an ideal lossless value.