Gear Ratio: 50-Tooth Driven / 25-Tooth Drive
A 50-tooth driven gear and a 25-tooth drive gear produce a 2:1 gear ratio.
How to use this tool
- Count (or look up) the teeth on both gears.
- Enter the driven gear (output) teeth and the drive gear (input) teeth.
- The calculator shows the gear ratio and torque multiplication factor.
With 50 teeth on the driven gear and 25 teeth on the drive gear, the gear ratio is exactly 2:1.
Frequently asked questions
- How do you calculate gear ratio?
- Gear ratio = driven gear teeth ÷ drive gear teeth. A ratio of 3:1 means the output shaft turns once for every three turns of the input shaft, multiplying torque by 3×.
- Does a higher gear ratio mean more speed or more torque?
- A numerically higher gear ratio (e.g. 4:1 vs 2:1) gives more torque multiplication but lower output speed. Lower ratios give higher speed with less torque amplification.