Pratique

Blood Alcohol Calculator

BAC Calculator

1 standard drink = 12oz beer (5%), 5oz wine (12%), or 1.5oz spirits (40%)

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Poids

Standard Drinks

Hours Drinking

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We're working on a comprehensive educational guide for the Blood Alcohol Calculator in your language. The content below is shown in English.

Qu'est-ce que Blood Alcohol Calculator?

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A Blood Alcohol Content (BAC) calculator estimates alcohol concentration in the blood using the Widmark formula. BAC is affected by drinks consumed, time elapsed, body weight, and sex.

Calkulon makes complex calculations simple — built for students and everyday problem-solvers.

Formule

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f(x)BAC = (Alcohol grams) / (Body weight kg × r) × 100 − (0.015 × hours), where r=0.68 (male), 0.55 (female)

Légende des variables

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Symbole	Nom	Unité	Description
BAC	Blood Alcohol Content	%	—
A	Alcohol consumed	grams	—
W	Body weight	kg	—
r	Distribution ratio	—	0.68 male, 0.55 female

Comment Blood Alcohol Calculator

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1BAC = (Alcohol consumed in grams) / (Body weight in g × r) − (0.015 × hours)
2r = 0.68 for men, 0.55 for women (body water distribution)
3Standard UK unit = 8g alcohol; US standard drink = 14g
4Legal UK driving limit: 80mg/100mL blood (0.08%)

Exemples résolus

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Exemple 1

Donné:2 pints beer (4.5%), 80kg male, 1 hour

Résultat:Alcohol ≈ 45.4g; BAC ≈ 45.4/(80,000×0.68) − 0.015 ≈ 0.068%

Applications pratiques

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Driving safety assessment

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Medical emergency response

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Occupational health screening

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Legal evidence in DUI cases

BAC Effects

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BAC %	Effects
0.02–0.05	Mild relaxation, slight impairment
0.06–0.10	Impaired judgement, legal limit in many countries
0.11–0.20	Significant impairment, slurred speech
0.20+	Severe impairment, risk of blackout or death

Questions fréquentes

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Why do women get drunk faster?

Women have lower body water % (r=0.55 vs 0.68 for men) and typically lower body weight, concentrating alcohol more.

What's the UK legal driving limit?

80 mg/100 mL blood (0.08% BAC) in England/Wales/Scotland. Scotland's limit is lower: 50 mg/100 mL.

Can food affect BAC calculation?

Food slows absorption but doesn't reduce total BAC. It delays peak BAC by 30-60 minutes.

Regional Guides

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UK▾

80 mg/100 mL (0.08%) England/Wales; 50 mg/100 mL (0.05%) Scotland

USA▾

80 mg/100 mL (0.08%) federal limit; 0.04% for commercial drivers

Australia▾

50 mg/100 mL (0.05%) general; 0% for learner/novice drivers

Références

›BAC — NIAAA

À titre informatif uniquement. Cet outil ne remplace pas un avis médical professionnel, un diagnostic ou un traitement. Consultez toujours un professionnel de santé qualifié.

Formula-verified for precision

Reviewed October 2026

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