Health & Fitness Calculators

Blood Alcohol Content (BAC) Estimator

Enter body weight, alcohol consumed, and time elapsed to estimate blood alcohol content using the Widmark formula.

0.021% estimated BAC

Uses the Widmark formula, a rough estimate at best — actual BAC is affected by food intake, metabolism, medication, and many other individual factors this can't account for. This is for educational purposes only — never use this (or any calculator) to decide whether it's safe to drive. When in doubt, don't drive.

How to use this tool

  1. 1Enter your sex, weight, and grams of alcohol consumed.
  2. 2Enter hours since your first drink.
  3. 3See the estimated BAC.

Frequently asked questions

Can I use this to decide if I'm safe to drive?+

No — never use this or any calculator to decide whether to drive. Individual metabolism varies enormously, and this is for education only, not a safety determination.

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