The following are examples of a class width.
 Difference between two consecutive lower class limits
 Difference between two consecutive upper class limits
If you don’t know the class width, use the class width formula.
Example of the the class width definition:
Frequency Distribution: 

Calories 
Frequency 
151200 
1 
201250 
2 
251300 
5 
301350 
3 
351400 
5 
401450 
4 
Class Width can be calculated by:
 Difference between two consecutive lower class limits
201151 = 50  Difference between two consecutive upper class limits
250200 = 50