Content

• Steps

You can use the Widmark formula to determine your blood alcohol content. The formula calculates the blood alcohol content based on the sex and weight of the person, the drinks consumed, and the time when the first drink was drunk. The exact formula to use is shown below.

Steps

1. 1 Find the formula. The generally accepted formula for calculating blood alcohol concentration is the Widmark formula, which can be found below.
   • Blood alcohol concentration = (standard drinks * 0.06 * 100 * 1.055 / weight * gender) - (0.015 * hours)
2. 2 Calculation of the drunk. A glass of beer - 350 ml, a glass of wine - 150 ml or a shot of liqueur - 45 ml, each counts as one standard drink. Take the number of standard drinks you drink and multiply by 0.06, since one standard drink has about 6% pure ethanol.
3. 3 Compensation of blood specific gravity. Take the number you got in step 2 and multiply it by 100 and then by 1.055 to calculate the specific gravity of blood.
4. 4 Multiply your body weight by sex constants. Multiply your weight in kilograms by your sex constant. The sex constant averages 0.68 for men and 0.55 for women.
5. 5 Divide step 3 into step 4. Divide the number you got in step 3 by the number you got in step 4 to get a rough estimate of your blood alcohol concentration.
6. 6 Calculate how much alcohol has been metabolized. Multiply the number of hours that have passed since the first drink was consumed by the alcohol elimination constant to calculate how much alcohol has been processed by the body. The alcohol elimination constant is on average 1.5% (or 0.015).
7. 7 Subtract the alcohol metabolized to find the final answer. Subtract from the number you got in step 5 the number you got in step 6 to find your blood alcohol content.
8. 8 Ready.