Blood Alcohol Content (BAC) Calculator
Enter drinks, weight, gender, and hours elapsed to estimate BAC and time to sobriety.
Estimate your blood alcohol content (BAC) using the scientifically validated Widmark formula. Enter the number of standard drinks consumed, your body weight, gender, and time elapsed since your first drink. This calculator is for educational purposes only — never drink and drive.
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Last reviewed: April 2026Report an error
Estimated BAC
0.053
BAC: 0.053 — Mild impairment. Reduced coordination, slowed reaction time. Under legal limit (0.08) — but impairment begins below 0.08. Time to sober: ~3.5 hrs.
BAC Level
0.053
Mild impairment
Legal Limit
0.080
Under limit
Hours to Sober
~3.5 hrs
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How to Use This BAC Calculator
- Enter the number of standard drinks consumed (1 standard drink = 14g pure alcohol = 12oz beer or 5oz wine).
- Enter your body weight in pounds.
- Select your gender.
- Enter hours elapsed since first drink.
- Read estimated BAC, impairment level, and estimated time to sober.
Frequently Asked Questions
- One standard drink contains 14 grams of pure alcohol: 12 oz regular beer (5% ABV), 5 oz wine (12% ABV), or 1.5 oz distilled spirits (40% ABV).
- The liver metabolizes alcohol at roughly 0.015 BAC per hour — about one standard drink per hour. Coffee, water, and food do not speed this up.
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