How does the BAC Calculator work?

BAC = (drinks × 14g × 0.789) / (weight_kg × distribution_ratio × 1000) × 100 Then: Distribution ratio (r): 0.68 for men, 0.55 for women (alcohol distributes into body water) Then: Subtract 0.015% per hour for alcohol metabolized by the liver Then: 1 standard drink = 14g pure alcohol = 12oz beer / 5oz wine / 1.5oz spirits.

Can you give an example of how to use the BAC Calculator?

Example: Input 160 lb male, 3 drinks in 2 hours gives a result of BAC ≈ 0.05% (Below legal limit but impaired).

Is the BAC Calculator 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 Calculator?

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

Thực tế

BAC Calculator

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

Sex:

Weight (lbs)

Standard Drinks

Hours Drinking

Blood Alcohol Content (BAC) measures the percentage of alcohol in the bloodstream. It is calculated using the Widmark formula, which accounts for body weight, sex, number of drinks, and time elapsed. A BAC of 0.08% is the legal driving limit in most US states.

BAC %	Effects	Legal status
0.01–0.03	Mild relaxation, slight euphoria	Legal everywhere
0.04–0.06	Feeling of warmth, lowered inhibitions	Legal (impaired)
0.07–0.09	Slight impairment of balance, speech	Illegal in most US states
0.10–0.12	Significant impairment, slurred speech	Illegal everywhere
0.13–0.15	Gross motor impairment, blurry vision	Dangerous
0.16–0.30	Nausea, possible blackout	Very dangerous
0.31+	Potential loss of consciousness	Life-threatening

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Pro Tip

BAC calculators estimate — not measure. Actual BAC varies based on medications, food intake, liver health, and individual metabolism. Never rely on a calculation to decide if it is safe to drive.

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Did You Know?

The liver metabolizes approximately 1 standard drink per hour regardless of sex, weight, or coffee intake. Only time reduces BAC — no food, water, or caffeine speeds this up.

References

›Blood alcohol content — Wikipedia

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BAC Effects by Level

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