Estimate Blood Alcohol Level

Estimate your Blood Alcohol Content (BAC) based on consumption and time.

Sex

Weight (kg)

Number of Drinks

Hours since first drink

Estimated BAC (%)

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Status

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The Methodology

Widmark Formula

This tool uses the verified professional formula shown above. We cite our sources so you can trust every result.

How it works

This tool uses the Widmark formula, which accounts for body mass and the different ways males and females process alcohol. It also accounts for the average rate at which the body metabolizes alcohol over time.

FAQ

Is this accurate for legal purposes?

No. This is an estimate only. Factors like food intake, medication, and individual metabolism play a huge role. Never drive if you have been drinking.