Gear Ratio Calculator

Calculate gear ratio, output speed, and output torque for spur gear pairs.

Ratio = Z₂ / Z₁

Output Speed = n₁ / Ratio

Output Torque = T₁ × Ratio × η

Teeth - Gear 1 (Z₁)

Teeth - Gear 2 (Z₂)

Input Speed (n₁), RPM

Input Torque (T₁), Nm

Efficiency (η), %

Gear Ratio-

Output Speed-

Output Torque-