Blood alcohol calculator

Estimating your blood-alcohol content.

The charts below (blood alcohol calculator) provide a theoretical blood-alcohol content, based on your gender, body weight, the number of drinks you had and the time elapsed from your first drink. Your blood alcohol level will usually rise with each drink you intake, and will generally become lower over time as your body processes and eliminates alcohol. An impaired driving lawyer refers to this process as your rate of absorption and elimination of alcohol.

Follow these steps to use the chart:

1. On the appropriate chart below, find the number opposite your body weight and under the number of drinks you had.
2. Subtract the amount of alcohol "burned up" (usually eliminated by your metabolism) since your first drink. For a quick calculation use the figure of .015 percent per hour. Your actual rate of alcohol elimination could be different from this.

Example #1

A 200 lbs man drinks 8 drinks in 5 hours.

0.15 - (0.015 X 5hrs) = 0.075

Example #2

A 120 lbs woman drinks 5 drinks in 3 hours.

0.114 – (0.015 X 3hrs) = 0.069

*These calculations should only be used as a general guideline for estimating blood or breath alcohol levels. The predicted alcohol levels may vary for different individuals and may not be valid for a given set of circumstances. A certified toxicologist should perform a calculation of blood alcohol concentration. An experienced impaired driving lawyer will know when to retain a toxicologist to provide an opinion. This opinion from the toxicologist will include the blood alcohol concentration based on what you actually had to drink, and what your actual elimination rate is. It is important that you refrain from using a blood alcohol calculator as a guide to whether or not it is safe to drink and drive. Impairment of ability to operate a motor vehicle can occur at low concentrations of alcohol.

Chart For Men

Chart for Women