Blood Alcohol Elimination Time Calculator
Using the Widmark formula, this calculator estimates your current blood alcohol concentration and how many hours it will take to metabolize the alcohol down to a target level (such as 0.00% or the legal driving limit).
About this calculator
Estimate how long it will take for your body to eliminate alcohol and reach a target BAC using the Widmark formula and average elimination rate.
Frequently Asked Questions
What is the Widmark formula?
The Widmark formula estimates blood alcohol concentration based on alcohol consumed, body weight, and a sex-specific distribution ratio, then accounts for elimination over time at roughly 0.015% per hour.
Is this calculator accurate enough to determine if I can drive?
No. This is a rough estimate for educational purposes only. Individual metabolism, food intake, medications, and other factors significantly affect actual BAC. Never rely on a calculator to decide whether it's safe to drive — use a breathalyzer or simply avoid driving after drinking.
What counts as one standard drink?
In the US, one standard drink is about 14 grams of pure alcohol — roughly a 12 oz beer, a 5 oz glass of wine, or a 1.5 oz shot of liquor.