Motor Pulley RPM Calculator

Calculate the RPM of a driven pulley based on motor RPM and pulley diameters.

Motor Pulley RPM Calculator

Accurate calculations for pulley systems

Results:

Driven Pulley RPM (RPM2): 0.00

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How to Use the Motor Pulley RPM Calculator

Input Motor RPM

  1. Enter the rotational speed of the motor in revolutions per minute (RPM).
  2. This is the speed of the driving pulley.

Input Motor Pulley Diameter (D1)

  1. Provide the diameter of the motor's pulley (D1).
  2. Ensure units are consistent (e.g., inches, cm).

Input Driven Pulley Diameter (D2)

  1. Provide the diameter of the driven pulley (D2).
  2. Ensure units are consistent with D1.

Pulley System Fundamentals

Pulley Ratio

The relationship between the diameters of the driving and driven pulleys determines the speed change in a belt-driven system.

RPM Relationship

  • When a smaller pulley drives a larger one, the driven pulley's RPM decreases.
  • Conversely, a larger driving pulley increases the driven pulley's RPM.

Key Formula:

Driven Pulley RPM (RPM2) = (Motor RPM (RPM1) × Motor Pulley Diameter (D1)) / Driven Pulley Diameter (D2)

Calculation Formula

Driven Pulley RPM (RPM2):
RPM2 = (RPM1 × D1) / D2

Example Calculation

Consider a motor with:

Motor RPM (RPM1): 1750 RPM

Motor Pulley Diameter (D1): 6 inches

Driven Pulley Diameter (D2): 12 inches

RPM2 = (1750 × 6) / 12 = 875 RPM

Result: 875 RPM

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