Enter the frequency and the class width into the calculator to determine the frequency density.

Frequency Density Formula

The following equation is used to calculate the Frequency Density.

FD = F / CW
  • Where FD is the frequency density
  • F is the frequency
  • CW is the class width

To calculate a frequency density, divide the total frequency by the class width.

What is a Frequency Density?


A frequency density is a measure of the ratio of the frequency of data to the class width of the same data.

How to Calculate Frequency Density?

Example Problem:

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

First, determine the frequency. In this example, the frequency is found to be 45.

Next, determine the class width. The class width for this example is found to be 20.

Finally, calculate the frequency density using the formula above:

FD = 45/ 20

FD = 45 / 20

FD =2.25