Calculation
i = z₂ / z₁
More teeth on the driven gear reduce speed and ideally increase torque.
i = z₂/z₁
Gear ratio from tooth counts
More teeth on the driven gear reduce speed and ideally increase torque.
MINTSI
02
Result
Select a target and calculate.
Understand the inputs
- Gear ratio i — Ratio of input to output speed.
- Pinion teeth z₁ — Teeth on the driving gear.
- Gear teeth z₂ — Teeth on the driven gear.
Example
20/50 teeth give i = 2.5.
Assumptions and limits
Ideal external gearing without slip or losses.
Sources