Calculate Mechanical Advantage & Transmission Ratios
Determine gear ratios, speed ratios, torque ratios, and mechanical advantage for any gear system. Input the number of teeth on driving and driven gears to get comprehensive results.
Click on any example to load it into the calculator
Common reduction for automotive transmissions
Driving Teeth: 20
Driven Teeth: 60
Input RPM: 1000 RPM
Input Torque (Nm): 50 Nm
Efficiency (%): 95%
High-speed applications like electric motors
Driving Teeth: 40
Driven Teeth: 20
Input RPM: 500 RPM
Input Torque (Nm): 30 Nm
Efficiency (%): 92%
Typical bicycle chainring to cassette ratio
Driving Teeth: 52
Driven Teeth: 14
Input RPM: 80 RPM
Input Torque (Nm): 25 Nm
Efficiency (%): 98%
Heavy machinery gear reduction system
Driving Teeth: 15
Driven Teeth: 75
Input RPM: 1500 RPM
Input Torque (Nm): 100 Nm
Efficiency (%): 94%