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) 

To calculate the alcohol burn-off rate, divide the total change in BAC by the time.

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 = ?