Gear Ratio Calculator
Ratio, output speed and torque.
Enter your values
Results update instantly as you type — no submit needed.
Results
- Gear ratio
- 3:1
- Output speed
- 583 rpm
- Output torque
- 36 Nm
- Mechanical advantage
- 3
Quick answer
Gear ratio is driven teeth divided by driving teeth; it trades speed for torque.
Ratio = driven teeth ÷ driving teeth
How to use the Gear Ratio Calculator
- 1Enter the tooth count of both gears.
- 2Enter input speed and torque.
- 3Read the output speed and torque.
Frequently asked questions
Does a gearbox create power?
No — torque rises only as speed falls, minus friction losses.
What is overdrive?
A ratio below 1:1, which raises speed and reduces torque.