实用工具

Blood Alcohol Calculator

血液酒精浓度计算器

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

性别：

重量

标准饮酒量

饮酒时间（小时）

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Detailed Guide Coming Soon

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

是什么 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.

公式

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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)

变量说明

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符号	名称	单位	描述
BAC	Blood Alcohol Content	%	—
A	Alcohol consumed	grams	—
W	Body weight	kg	—
r	Distribution ratio	—	0.68 male, 0.55 female

如何 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%)

例题解析

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示例 1

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

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

实际应用

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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

常见问题

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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

参考资料

›BAC — NIAAA

仅供参考。此工具不能替代专业医疗建议、诊断或治疗。请务必咨询合格的医疗保健专业人员。

Formula-verified for precision

Reviewed October 2026

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