Physics

Gear Ratio RPM Calculator

Find output rpm from input rpm and gear ratio.

Calculated Output

Output speed (rpm) 1,000

Formula: output rpm = input rpm ÷ ratio

Step-by-Step Breakdown

1. Values used:

2. Input speed = 3,000 rpm

3. Gear ratio (input:output) = 3

5. Output speed = Input speed / Gear ratio (input:output) = 3,000 / 3 = 1,000rpm

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The math behind it

output rpm = input rpm ÷ ratio. A 3:1 reduction cuts speed to a third (and triples torque).

3000 rpm through 3:1 → 1000 rpm.

What happens to torque?

It multiplies by the same ratio that the speed divides by.