Gears
Gear Torque Ratio Calculator
Enter input torque and gear tooth counts to estimate ideal torque multiplication or reduction in a simple gear pair before losses.
Inputs
Formula
Ideal gear torque ratio
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
- Input torque
- 20 N*m
- Driver gear teeth
- 20 teeth
- Driven gear teeth
- 60 teeth
Result
- Ideal driven torque
- 60 N*m
Related calculators
Continue your workflow with a related calculation.
Gears
Gear Ratio Calculator
Calculate ideal external gear ratio from driver and driven gear tooth counts.
Gears
Gear RPM Calculator
Calculate driven gear RPM from driver RPM and the tooth counts of a simple external gear pair.
Power, Torque & Speed
Torque from Power and RPM Calculator
Calculate shaft torque from mechanical power and rotational speed.
Frequently asked questions
Does gear reduction increase torque?
Ideally, a reduction ratio increases output torque in the same proportion that it reduces speed.
Does this include gearbox efficiency?
No. Real output torque is lower because of mesh, bearing, seal, and lubrication losses.