Chains & Sprockets
Sprocket Torque Ratio Calculator
Enter input torque and both sprocket tooth counts to estimate the ideal torque multiplication or reduction before drivetrain losses.
Inputs
Formula
Ideal sprocket 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 sprocket teeth
- 20 teeth
- Driven sprocket teeth
- 60 teeth
Result
- Ideal driven torque
- 60 N*m
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Calculate driven sprocket RPM from driver RPM and sprocket tooth counts.
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Torque from Power and RPM Calculator
Calculate shaft torque from mechanical power and rotational speed.
Frequently asked questions
Does a larger driven sprocket increase torque?
Ideally, yes. Increasing driven tooth count relative to the driver reduces speed and raises torque by the same ratio.
Does this include chain efficiency?
No. It is an ideal kinematic result and does not subtract bearing, chain articulation, lubrication, or other drivetrain losses.