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BAC Calculator

Roughly estimate blood alcohol content with the Widmark formula. This estimate must never be used to decide whether it is safe or legal to drive.

Enter your details above and the result will appear here.

How to use

  1. Enter the total volume of drinks consumed and their average ABV.
  2. Enter your body weight and sex.
  3. Enter the hours since you started drinking.

Note

Uses the Widmark formula with an average elimination rate of 0.015 percent per hour. Food, medicines, fatigue and individual differences change real BAC a lot. Never drive after drinking — this number cannot tell you whether you are fit or legal to drive. Estimate only — not medical advice.

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