Enter the monthly bill amount ($) and the number of days used in the month into the Prorated Bill Calculator. The calculator will evaluate and display the Prorated Bill. 

Prorated Bill Formula

The following formula is used to calculate the Prorated Bill. 

PB = MB / 30.5 * #D

  • Where PB is the Prorated Bill ($)
  • MB is the monthly bill amount ($) 
  • #D is the number of days used in the month 

How to Calculate a Prorated Bill?

The following example problems outline how to calculate Prorated Bill.

Example Problem #1:

  1. First, determine the monthly bill amount ($). 
    • The monthly bill amount ($) is given as: 700.
  2. Next, determine the number of days used in the month. 
    • The number of days used in the month is provided as: 10.
  3. Finally, calculate the Prorated Bill using the equation above: 

PB = MB / 30.5 * #D

The values given above are inserted into the equation below and the solution is calculated:

PB = 700 / 30.5 * 10 = 229.508 ($)


Example Problem #2: 

For this problem, the variables needed are provided below:

monthly bill amount ($) = 800

number of days used in the month = 15

This example problem is a test of your knowledge on the subject. Use the calculator above to check your answer. 

PB = MB / 30.5 * #D = ?