実用

Blood Alcohol Calculator

BAC Calculator

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

性別：

体重

Standard Drinks

Hours Drinking

🌐

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.

とは何か Blood Alcohol Calculator?

▾

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

▾

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

変数の説明

▾

記号	名前	単位	説明
BAC	Blood Alcohol Content	%	—
A	Alcohol consumed	grams	—
W	Body weight	kg	—
r	Distribution ratio	—	0.68 male, 0.55 female

方法 Blood Alcohol Calculator

▾

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%)

解いた例

▾

例 1

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

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

実際の応用

▾

🏗️

Driving safety assessment

🔬

Medical emergency response

📊

Occupational health screening

🏥

Legal evidence in DUI cases

BAC Effects

▾

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

よくある質問

▾

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

▾

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

参考文献

›BAC — NIAAA

情報提供のみを目的としています。このツールは専門的な医学的助言、診断、治療の代わりにはなりません。必ず資格を持つ医療専門家にご相談ください。

Formula-verified for precision

Reviewed October 2026

Our methodology

Ratings & comments

…

Get Weekly Math Tips

Join 12,000+ subscribers who get calculator tips every week.

🔒

100% 無料

登録不要

✓

正確

検証済み数式

⚡

即座

即座に結果を表示

📱

モバイル対応

全デバイス対応