Home Back

Pulley Size vs RPM Calculator

Pulley Size vs RPM Calculator

The relationship between pulley size (diameter) and RPM (Revolutions Per Minute) can be calculated using the following formula:

\( D_2 = D_1 \cdot \frac{RPM_1}{RPM_2} \)

Parameters:

- \( D_1 \): Diameter of the first pulley (in meters).
- \( RPM_1 \): Rotation rate of the first pulley (in revolutions per minute).
- \( RPM_2 \): Rotation rate of the second pulley (in revolutions per minute).
- \( D_2 \): Diameter of the second pulley (to be calculated).

Example Calculation

If the diameter of the first pulley (\( D_1 \)) is 0.5 m, the RPM of the first pulley (\( RPM_1 \)) is 120 RPM, and the RPM of the second pulley (\( RPM_2 \)) is 60 RPM, the diameter of the second pulley would be:

\( D_2 = 0.5 \cdot \frac{120}{60} = 1.0 \, \text{m} \)

Frequently Asked Questions

What is the purpose of this calculator?

This calculator helps determine the diameter of a second pulley based on the diameter and rotation rate of the first pulley and the rotation rate of the second pulley. It is useful in mechanical and engineering applications.

Can I use different units for RPM?

Yes, the calculator supports various units for rotation rate, including RPM, radians/second, degrees/second, and more. All inputs are converted to RPM for accurate calculations.

What if my diameter is in inches or feet?

The calculator accepts diameter inputs in meters, centimeters, inches, feet, and yards, and automatically converts them to meters for the calculation. Results are provided in multiple units for convenience.

What happens if I enter zero for RPM?

Entering zero for any RPM value will result in no calculation, as division by zero is undefined. Please ensure all RPM values are greater than zero.

Why are the results shown in multiple units?

The results are displayed in multiple units (meters, centimeters, millimeters, feet, inches, yards) to allow you to use the value in your preferred unit.

Pulley Size vs RPM Calculator© - All Rights Reserved 2025