Gear Ratio Calculation Made Simple!

Understanding gear ratio is essential for every mechanical engineer, maintenance professional, and engineering student.

Given: Driver Gear (Z₁) = 12 Teeth

Driver Speed (N₁) = 1200 RPM

Driven Gear (Z₂) = 36 Teeth

Formula: Gear Ratio = Z₂ / Z₁ = N₁ / N₂

Calculation: Gear Ratio = 36 ÷ 12 = 3:1

Driven Speed (N₂) = 1200 ÷ 3 = 400 RPM

Key Learning:

As the gear ratio increases, the output speed decreases while the output torque increases—one of the fundamental principles of power transmission.

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