BAC Calculator

Time Required to Metabolize Alcohol



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Use this Blood Alcohol Content (BAC) calculator to determine your approximate blood alcohol content, based on your weight, the amount of alcohol you have consumed, the percent alcohol the beverage was, and the time it took you to drink it.

The calculator is an approximation of the effects certain alcoholic beverages can have on your system. The BAC calculator is not meant to be considered a definitive test as to your blood or breath alcohol concentration or whether you would be arrested for Driving Under the Influence (DUI) or Driving While Intoxicated (DWI) under the laws of South Carolina or your particular state. If you are arrested for a drunk driving offense, it is very important to contact a DUI Defense Attorney as soon as possible.


BAC Calculator


The normal body will metabolize between .015 percent and .020 percent BAC per hour. We use a conservative .016 percent BAC per hour in the following charts. Some heavy drinkers may eliminate alcohol at a slightly higher rate and certain physical conditions may cause some people to metabolize alcohol at a slower rate.

The following chart will give you an idea of the number of hours it takes for women and men to reach zero BAC (no alcohol remaining in the blood stream) for a variety of body weights and different numbers of drinks.

SC DUI Chart

  1. Count the number of drinks you have had (one drink equals 1 oz. of 100 proof liquor, 12 oz. beer, or 5 oz. of wine)
  2. The chart determines the maximum blood alcohol for the number of drinks and your body weight. (This is the maximum Blood Alcohol Content (BAC) you would have if you drank all the alcohol in 1 hour)
  3. Subtract from the percent blood alcohol content the amount of alcohol eliminated since the time of the first drink, using the average elimination rate of 0.015% per hour.

You will probably be surprised to learn how much time it takes for your body to eliminate alcohol from the bloodstream even though you can raise your BAC quickly by slamming drinks. BAC goes down at a slow and predictable rate. This is because your liver can only metabolize a predictable blood alcohol concentration per hour.


The results from the BAC calculator are estimates of what an average person with normal health's BAC would be assuming average beverage sizes and alcohol content. These estimates should not be used to infer anyone's fitness to work, drive or perform any other task or duty.