BALKE WORKBENCH / MAKER & MOTION

Gear ratio calculator.

Calculate gear reduction, output speed, torque estimates, and rotation direction for simple and compound gear trains.

Local calculations · live results

Input shaft & stages

Input RPM0 means stationary; speeds are nonnegative magnitudes.Input torque (N·m) · optionalLeave blank to omit torque and power results.Torque units

Stage 1 · external mesh

Stage 1 driver teethStage 1 driven teethStage 1 efficiency (%)100% = ideal

Up to 12 stages. Each stage’s driven gear shares a shaft with the next stage’s driver. This is compound gearing, not a simple sequence of idler gears.

OUTPUT SHAFT

300 RPM

Speed reduction · opposite rotation relative to input when turning

Arrows show relative direction; input clockwise is the reference.

Schematic · not to scale

Overall reduction · input RPM / output RPM: 3:1
Final output speed: 300 RPM
Speed relationship: Speed reduction
Rotation relative to input (when turning): Opposite
Overall efficiency: 100 %
Estimated output torque: 3 N·m
Input mechanical power: 94.24778 W
Output mechanical power: 94.24778 W

Stage	Reduction	Output RPM	Efficiency
1	3:1	300	100 %

Calculation summary

Gear Ratio Calculator
Input: 900 RPM; torque: 1 N·m
Stage 1: 20 → 60 teeth; 100% efficiency; 3:1; 300 RPM; opposite rotation relative to input
Overall reduction · input RPM / output RPM: 3:1
Final output speed: 300 RPM
Speed relationship: Speed reduction
Rotation relative to input (when turning): Opposite
Overall efficiency: 100 %
Estimated output torque: 3 N·m
Input mechanical power: 94.24778 W
Output mechanical power: 94.24778 W
External gear pairs only. Successive stages share shafts (compound train), not a chain of idlers. Torque is an efficiency-based estimate, not allowable torque. No tooth strength, compatibility, backlash, planetary, worm, or internal gearing model.