1. What is the Widmark Formula?

The Widmark formula estimates blood alcohol concentration (BAC) based on the amount of alcohol consumed, body weight, gender, time since consumption, and individual metabolism rates. It's a widely used method for approximating alcohol levels in the body.

2. How Does the Calculator Work?

The calculator uses the Widmark formula:

Where:

• \( A \) — Alcohol consumed in grams
• \( W \) — Body weight in grams
• \( r \) — Distribution ratio (0.68 for men, 0.55 for women)
• \( \beta \) — Elimination rate (typically 0.015%/hour)
• \( t \) — Time since consumption in hours

Explanation: The formula accounts for alcohol distribution in body water and the rate at which the body metabolizes alcohol over time.

3. Importance of BAC Calculation

Details: Understanding BAC helps assess impairment levels, determine legal limits for driving, and make informed decisions about alcohol consumption.

4. Using the Calculator

Tips: Enter accurate measurements of alcohol consumed and body weight. The gender selection automatically adjusts the distribution ratio. Time since last drink significantly affects results.

5. Frequently Asked Questions (FAQ)

Q1: What's the legal BAC limit for driving?
A: In most US states, 0.08% is the legal limit for non-commercial drivers over 21, but impairment can begin at lower levels.

Q2: How accurate is the Widmark formula?
A: It provides an estimate. Actual BAC can vary based on food intake, metabolism, medication, and individual differences.

Q3: How do I convert drinks to grams of alcohol?
A: Standard drink (14g alcohol) = 12oz beer (5%) / 5oz wine (12%) / 1.5oz spirits (40%).

Q4: Why is the ratio different for women?
A: Women typically have higher body fat percentage and less body water, leading to higher BAC for same alcohol intake.

Q5: Can I use this to determine if I'm safe to drive?
A: This is only an estimate. The only safe BAC for driving is 0.00%. When in doubt, don't drive.