Gear Ratio Calculator
Mechanical Advantage & Speed
Calculate gear ratios for simple and compound gear systems. Find mechanical advantage, output speed, and vehicle velocity.
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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