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Blood Alcohol Calculator

BAC Calculator

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

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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.

O que é 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.

Fórmula

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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)

Legenda de variáveis

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Símbolo	Nome	Unidade	Descrição
BAC	Blood Alcohol Content	%	—
A	Alcohol consumed	grams	—
W	Body weight	kg	—
r	Distribution ratio	—	0.68 male, 0.55 female

Como 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%)

Exemplos resolvidos

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Exemplo 1

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

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

Aplicações práticas

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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

Perguntas frequentes

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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

Referências

›BAC — NIAAA

Apenas para fins informativos. Esta ferramenta não substitui aconselhamento médico profissional, diagnóstico ou tratamento. Consulte sempre um profissional de saúde qualificado.

Formula-verified for precision

Reviewed October 2026

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