Blood Alcohol Content (BAC) Calculator

Estimate your BAC with the Widmark formula

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1 standard drink ≈ 14 g pure alcohol

time spent drinking and after

Blood Alcohol Content (BAC) Calculator

This calculator uses the classic Widmark formula to estimate blood alcohol content (BAC) from your body weight, sex, number of standard drinks and the hours since your first drink, accounting for alcohol your body has already metabolised (about 0.015% per hour). It also estimates how long until you're sober. Real BAC varies with food, hydration, medications and individual metabolism, so treat the result as a rough guide only and never drive after drinking.

Rough estimate (Widmark formula) only. Many factors change real BAC. Never drive after drinking — this is not legal or medical advice.

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