Gears
Gear RPM Calculator
Enter driver speed and both gear tooth counts to calculate the ideal driven-shaft speed.
Inputs
Formula
Driven gear speed
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
- Driver speed
- 1,450 rpm
- Driver gear teeth
- 20 teeth
- Driven gear teeth
- 60 teeth
Result
- Driven speed
- 483.3 rpm
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 Teeth Calculator for Target RPM
Estimate the driven gear tooth count required to reach a target RPM from a known driver gear and speed.
Gears
Gear Torque Ratio Calculator
Estimate ideal driven-shaft torque from input torque and driver/driven gear tooth counts.
Frequently asked questions
Does this account for gear direction?
It calculates speed magnitude only. Two external gears rotate in opposite directions.
Can I use this for a multi-stage gearbox?
Apply each stage ratio in sequence or multiply stage ratios first, provided each stage is represented correctly.