Blood Alcohol Calculator

Calculate your blood alcohol concentration based on the Widmark formula.

Gender

Weight (kg)

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Drinks

Volume (ml)

Alcohol (%)

Hours since first drink

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BAC range	Effect
0.0 ‰	No impairment
0.1–0.3 ‰	Slight disinhibition, feeling of warmth
0.3–0.5 ‰	Reduced reaction time, elevated mood
0.5–1.1 ‰	Noticeable impairment of coordination and reaction time
1.1–2.0 ‰	Severe balance issues, slurred speech
> 2.0 ‰	Impaired consciousness, life-threatening

How it works

This calculator uses the Widmark formula: Alcohol (g) = Volume × (ABV / 100) × 0.8. BAC = Alcohol (g) / (Body weight × r), where r = 0.68 (men) or 0.55 (women). Elimination rate is approximately 0.15‰ per hour. This is an estimate — individual factors may vary.

Blood Alcohol Calculator: How Long Until You're Sober? →

Calculate your blood alcohol level with the Widmark formula. Alcohol elimination rate, influencing factors, legal limits and time until sober.