Widmark BAC Decay Timeline Calculator
This calculator applies the classic Widmark equation to estimate blood alcohol concentration (BAC) at a given point in time, accounting for body weight, biological sex distribution ratio, total alcohol consumed, and average metabolism rate. Use it for educational and planning purposes only — never to determine if it's safe to drive.
About this calculator
Estimate how your blood alcohol concentration changes over time using the Widmark formula, factoring in weight, sex, drinks consumed, and elapsed hours.
Frequently Asked Questions
What is the Widmark formula?
It's a formula developed by E.M.P. Widmark that estimates blood alcohol concentration based on alcohol consumed, body weight, and a sex-based distribution ratio, adjusted for time elapsed and average metabolism rate.
Is this calculator accurate enough to know if I can drive?
No. This is an educational estimate only. Actual BAC varies with food intake, medications, individual metabolism, and other factors. Never use any calculator to decide whether to drive — always wait it out or use a real breathalyzer and err on the side of caution.
What counts as a standard drink?
In the US, a standard drink is about 14 grams of pure alcohol — roughly a 12oz beer, a 5oz glass of wine, or a 1.5oz shot of liquor.