Skip to main content
Back to Calculators

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.