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Blood Alcohol Content (BAC) Calculator

Quick answer: 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

  1. 1Enter the number of standard drinks consumed (1 standard drink = 14g pure alcohol = 12oz beer or 5oz wine).
  2. 2Enter your body weight in pounds.
  3. 3Select your gender.
  4. 4Enter hours elapsed since first drink.
  5. 5Read estimated BAC, impairment level, and estimated time to sober.

Frequently Asked Questions

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