Gear Ratio Calculator
Mechanical Advantage & Speed
Calculator
About Gear Ratios
Gear ratio is the relationship between the number of teeth on two gears that are meshed.
Speed reduction, torque multiplication
Speed increase, torque reduction
Features
- Simple gear ratio
- Compound gear systems
- Speed calculation
- Mechanical advantage
- Output RPM
- Vehicle speed
- Real-world examples
- Copy results
Common Ratios
2:1 to 4:1 (speed increase)
3:1 to 4:1 (reduction)
0.7:1 (speed increase)
3:1 to 4.5:1 (reduction)
Key Terms
Driving Gear: Input gear (power source)
Driven Gear: Output gear (load)
Compound Gears: Multiple gear pairs in series
Mechanical Advantage: Force multiplication
Applications
- Automotive transmissions
- Bicycle gear systems
- Industrial machinery
- Robotics
- Clock mechanisms
- Power tools
- Conveyor systems
- Wind turbines
Design Considerations
Important Factors:
Torque vs Speed: Higher ratio = more torque, less speed
Efficiency: Each gear pair loses ~2-5% efficiency
Backlash: Gap between meshing teeth
Load Capacity: Larger gears handle more power
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