In a frequency distribution, class width refers to the difference between the upper and lower boundaries of any class or category. It is calculated as:

Class width = (max – min) / n

where:

max is the maximum value in a dataset
min is the minimum value in a dataset
n is the number of classes

To calculate class width, simply fill in the values below and then click the “Calculate” button.

Minimum value Maximum value Number of classes (n)

Class Width: 3.5556

Explanation:

Class Width = (max – min) / n

Class Width = (36 – 4) / 9 = 3.5556