How does the BAC & Alcohol Recovery work?

Widmark formula: BAC% = (Alcohol grams) / (Body weight kg × 1000 × r) − 0.015 × hours Then: r = 0.68 (males), 0.55 (females) — distribution factor Then: 1 UK unit = 10ml pure alcohol = ~8g Then: Alcohol eliminated at ~0.015% per hour (linear, not exponential).

Can you give an example of how to use the BAC & Alcohol Recovery?

Example: Input 4 pints (4% lager) · 70kg male · 2 hours drinking gives a result of BAC ≈ 0.087% (over UK legal limit of 0.08%) (Drive limit 0.05% in Scotland, 0.08% in England/Wales).

Is the BAC & Alcohol Recovery free to use?

Yes — completely free with no registration, download, or subscription required. All calculations happen instantly in your browser.

How accurate is the BAC & Alcohol Recovery?

Our BAC & Alcohol Recovery uses verified mathematical formulas and is accurate to multiple decimal places. Results are calculated in real-time using the same methods used by professionals.

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BAC & Alcohol Recovery

🍺Alcohol & BAC Recovery Calculator

⚠️ Estimated BAC only. Never drink and drive.

Standard drinks

Weight (kg)

Hours drinking

Blood Alcohol Concentration (BAC) estimates how much alcohol is in the bloodstream, calculated using the Widmark formula. BAC is influenced by units consumed, body weight, time elapsed, and biological sex (different body water percentages).

BAC %	Typical effects
0.02–0.05	Relaxation, mild impairment
0.05–0.08	Judgement impaired, coordination reduced
0.08–0.15	Legally drunk in most countries, clear impairment
0.15–0.25	Significant impairment, nausea possible
> 0.25	Risk of unconsciousness, death risk > 0.40%

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Pro Tip

BAC estimates are highly variable between individuals. Never use BAC calculators to make decisions about driving — use a calibrated breathalyser or simply do not drive after drinking.

References

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🍺Alcohol & BAC Recovery Calculator

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