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Blood Alcohol Content (BAC) Calculator

Estimate your blood alcohol content.

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Blood Alcohol Content (BAC) Calculator
Estimate your blood alcohol content. This is an estimate and not legally binding.

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Estimate Your Blood Alcohol Content

This calculator provides an estimate of your Blood Alcohol Content (BAC) for informational and educational purposes only. It uses a modified Widmark formula, which takes into account your body weight, gender, the number of standard drinks consumed, and the time over which they were consumed.

The Formula Explained

A simplified version of the Widmark formula is: BAC % = ( (Total Alcohol Consumed in grams / (Body Weight in grams * Gender Constant)) * 100 ) - (Hours Since First Drink * 0.015)

  • Gender Constant (r): This is approximately 0.68 for men and 0.55 for women, reflecting differences in body water content.
  • 0.015: Represents the average rate at which the body metabolizes alcohol per hour.

How to Use the Calculator

  1. Gender & Weight: Select your gender and enter your body weight.
  2. Drinks: Enter the number of 'standard drinks' you have consumed.
  3. Time: Enter the number of hours that have passed since you started drinking.

Real-World Example

A 180 lb male consumes 4 standard drinks over 2 hours.

  • The calculator will estimate his BAC to be approximately 0.052%.

Frequently Asked Questions (FAQ)

  • What is a 'standard drink'? In the US, a standard drink contains about 14 grams of pure alcohol. This is equivalent to one 12-oz beer (5% ABV), one 5-oz glass of wine (12% ABV), or one 1.5-oz shot of distilled spirits (40% ABV / 80 proof).
  • Is this calculator legally accurate? NO. Absolutely not. This is a rough estimate for educational purposes. Many factors affect BAC, including metabolism, food consumption, and medication. Never use this calculator to determine if it is safe to drive. The only safe BAC for driving is 0.00%.
  • What do the BAC levels mean?
    • 0.02%: Some loss of judgment.
    • 0.05%: Lowered alertness, impaired judgment.
    • 0.08%: The legal limit for driving in most US states. Significant impairment of muscle coordination, judgment, and reasoning.
    • 0.15% and above: Far-reaching impairment, risk of alcohol poisoning.