Enter the pitch diameter, rotational speed of the sheave, and the belt length into the calculator to determine the belt frequency.

- Belt Speed Calculator
- Belt Length Calculator (2 pulley system)
- Surface Speed (SFM) Calculator
- Belt Ratio Calculator

## Belt Frequency Formula

The following equation is used to calculate the Belt Frequency.

BF = pi*D*N/L

- Where BF is the belt frequency
- D is the diameter of the sheave (in)
- N is the rotational speed of the sheave (RPM)
- L is the length of the belt (in)

To calculate the belt length, multiply the diameter by the RPM, then multiply by pi, then divide by the belt length.

## What is a Belt Frequency?

Definition:

A belt frequency is a rate at which a belt completes a full complete cycle of its length. In other words, it’s a measure of the time it takes to travel the full length of the belt.

## How to Calculate Belt Frequency?

Example Problem:

The following example outlines the steps and information needed to calculate Belt Frequency.

First, determine the sheave diameter. In this example, the diameter is measured to be 5 inches.

Next, determine the RPM of the sheave. This is found to be 50 RPM.

Next, determine the belt length. This belt is measured to have a length of 36 inches.

Finally, calculate the belt frequency using the formula above:

BF = pi*D*N/L

BF = 3.14159*5*50/36

BF = 21.8165 belt lengths/min