Gear Ratio Calculator
Calculate gear ratio, speed, and torque output
Gear ratios determine how speed and torque are transformed in a mechanical system. Use this tool to design your gearbox.
Calculator Inputs
Output gear
Input/Motor gear
Results
Enter values above to see your results
How It Works
Ratio = Driven Teeth / Driver Teeth. Output Speed = Input Speed / Ratio. Output Torque = Input Torque × Ratio.
Tips & Best Practices
- •A high ratio (e.g., 4:1) reduces speed but increases torque (Torque Gearing).
- •A low ratio (e.g., 0.5:1) increases speed but reduces torque (Speed Gearing).
Frequently Asked Questions
Does this account for efficiency?
No, this calculates ideal mechanical advantage. Real systems lose power to friction.
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