Estimate blood alcohol content (BAC) using the Widmark formula. This is an educational estimate only — actual BAC varies by individual, and you should never drive after drinking regardless of the result.
This tool provides an educational estimate of blood alcohol content based on standard drinks consumed, body weight, gender, and time elapsed.
This tool uses the Widmark formula, which accounts for total alcohol consumed, body water distribution (different for men and women), and the average rate the body eliminates alcohol over time.
Enter your gender, weight, number of standard drinks, and hours elapsed since your first drink, then click Calculate.
Example: A 75kg male who had 3 standard drinks over 2 hours would see an estimated BAC in the moderate impairment range.
Is this accurate enough to decide if I can drive. No. This is a rough educational estimate only. Individual factors like food intake, medication, and metabolism vary widely. Never drive after drinking.
What counts as one standard drink. Roughly 14 grams of pure alcohol, equivalent to a standard beer, a glass of wine, or a shot of spirits.