1. What is the Widmark Formula?

The Widmark formula is a mathematical equation used to estimate blood alcohol concentration (BAC) based on the amount of alcohol consumed, body weight, gender, and time since drinking. It provides an approximation of BAC that can be useful for educational purposes.

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 males, 0.55 for females)
• \( \beta \) — Elimination rate (0.015 %/hour)
• \( t \) — Time since drinking in hours

Explanation: The formula accounts for alcohol distribution in body water and the gradual elimination of alcohol over time.

3. Importance of BAC Calculation

Details: Understanding BAC helps individuals make informed decisions about alcohol consumption and driving. Legal limits vary by jurisdiction but are typically around 0.08% in many countries.

4. Using the Calculator

Tips: Enter alcohol consumed in grams (1 standard drink ≈ 14 grams), body weight in grams (1 lb ≈ 453.6 grams), select gender, and enter time since drinking started. All values must be valid (alcohol > 0, weight > 0, time ≥ 0).

5. Frequently Asked Questions (FAQ)

Q1: How accurate is the Widmark formula?
A: It provides an estimate but actual BAC can vary due to factors like metabolism, food consumption, and individual differences.

Q2: What is considered a standard drink?
A: Typically 14 grams of pure alcohol - equivalent to 12 oz beer (5% ABV), 5 oz wine (12% ABV), or 1.5 oz spirits (40% ABV).

Q3: How long does it take to eliminate alcohol?
A: On average, BAC decreases by about 0.015% per hour, but this varies by individual.

Q4: Are there limitations to this formula?
A: Yes, it doesn't account for individual metabolism, drinking speed, food intake, or medication interactions.

Q5: Can I use this to determine if I'm safe to drive?
A: This is for educational purposes only. The only safe driving limit is zero alcohol.