Enter the total change in BAC and the total time (hrs) into the Alcohol Burn Off Rate Calculator. The calculator will evaluate the Alcohol Burn Off Rate. 

Alcohol Burn Off Rate Formula

The following two example problems outline the steps and information needed to calculate the Alcohol Burn Off Rate.


  • Where ABOR is the Alcohol Burn Off Rate (bac/hour)
  • CBAC is the total change in BAC 
  • T is the total time (hrs) 

How to Calculate Alcohol Burn Off Rate?

The following example problems outline how to calculate Alcohol Burn Off Rate.

Example Problem #1:

  1. First, determine the total change in BAC. 
    • The total change in BAC is given as: .020.
  2. Next, determine the total time (hrs). 
    • The total time (hrs) is provided as: 2.
  3. Finally, calculate the Alcohol Burn Off Rate using the equation above: 


The values provided above are inserted into the equation below and computed.

ABOR = .020 / 2 = .010 (bac/hour)

Example Problem #2: 

For this problem, the variables required are provided below:

total change in BAC = .030

total time (hrs) = 3

Test your knowledge using the equation and check your answer with the calculator..

ABOR = BAC / T = ?