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Blood Alcohol Content Estimator - Online BAC Calculator

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Blood Alcohol Content (BAC) Estimator

Estimate your blood alcohol concentration based on your drinking session. This tool uses the Widmark formula and is for educational purposes only. Never drink and drive.

Personal Details

Your current body weight.

Drinking Period

Time passed: 3.0 hours

Drinks Consumed

Total alcohol: 14.0 g

Your Estimated BAC

0.000%

Time until sober (BAC 0.00%): 0.0 hours

Estimated based on average metabolism rate of 0.015% per hour.

BAC Effects Reference
  • 0.02%–0.03%: Mild euphoria, loss of shyness
  • 0.04%–0.06%: Relaxation, lowered inhibitions, minor impairment
  • 0.07%–0.09%: Slight impairment of balance, speech, vision
  • 0.08%+: Legally intoxicated in many countries (e.g., USA)
  • 0.10%–0.12%: Motor coordination significantly impaired

This calculator provides an estimate. Individual metabolism varies. Do not rely on it to decide whether you can drive.

Frequently Asked Questions

Blood Alcohol Content (BAC) is the percentage of alcohol in a person's bloodstream. For instance, a BAC of 0.08% means 0.08 grams of alcohol per 100 milliliters of blood. It is used to measure intoxication levels and legal impairment for driving.

This tool uses the Widmark formula:
BAC% = (Alcohol grams / (Body weight grams × r)) × 100 – (0.015 × hours)
where r is the gender-specific Widmark factor (0.68 for males, 0.55 for females) and 0.015 is the average elimination rate per hour.

Divide your current BAC by 0.015 to get the approximate hours needed. Example: a BAC of 0.08% takes about 5.3 hours to return to zero. This varies based on metabolism, food intake, and other factors.

Key factors include gender, body weight, amount of alcohol consumed, drinking duration, food in the stomach, medication, liver function, and individual metabolic rate. The calculator accounts for the most important ones.

No, it provides an estimate based on average population constants. Individual physiology, food, and other variables can cause actual BAC to vary. Always plan for a safe ride if you drink. The only truly safe BAC for driving is 0.00%.

In the US, one standard drink contains about 14 grams of pure alcohol. That’s roughly: 12 oz of regular beer (5% ABV), 5 oz of table wine (12% ABV), or 1.5 oz of 80-proof spirits (40% ABV). Use the preset options for quick estimation.
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