Get an educational estimate of blood alcohol content using the Widmark formula, based on weight, drinks, gender and time.
The BAC Calculator provides an educational estimate of blood alcohol content using the widely referenced Widmark formula. It is intended for awareness purposes only.
Actual BAC is affected by many factors this formula cannot capture — food intake, metabolism, medication, and drink strength among them. Never use this tool to decide whether it is safe to drive; always plan a sober ride if you have been drinking.
BAC = (Drinks × 0.6 × 5.14 ÷ (Weight × r)) − (0.015 × Hours), where r is 0.68 for men and 0.55 for women, and 0.6 oz is the alcohol content of one standard drink.
A 170 lb man who has had 3 standard drinks over 2 hours has an estimated BAC of roughly 0.05% — this example is for illustration only and should never be used to judge fitness to drive.
This calculator uses the Widmark formula, which factors in the amount of alcohol consumed, body weight, sex, and time elapsed since drinking.
No. It gives a rough estimate only — actual BAC is affected by metabolism, food intake, medication, and other factors that vary by person. Never use it to decide whether it's safe to drive; use a breathalyzer or simply don't drive after drinking.
The body eliminates alcohol at a fairly steady rate, roughly 0.015% BAC per hour on average, though this varies from person to person.