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Widmark Formula:
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The Widmark formula is a mathematical equation used to estimate blood alcohol concentration (BAC) based on the amount of alcohol consumed, body weight, and gender. It was developed by Swedish professor Erik Widmark in the 1930s and remains widely used for BAC estimation.
The calculator uses the Widmark formula:
Where:
Explanation: The formula estimates BAC by dividing the total alcohol consumed by the product of body weight and the distribution factor, then multiplying by 100 to convert to percentage.
Details: Accurate BAC estimation is crucial for understanding alcohol impairment levels, legal limits for driving, and making informed decisions about alcohol consumption and safety.
Tips: Enter alcohol consumption in grams, body weight in grams, and select gender. Remember that 1 standard drink typically contains approximately 14 grams of pure alcohol.
Q1: What is the legal BAC limit for driving?
A: In most countries, the legal limit is 0.08% for drivers aged 21 and over, but this varies by jurisdiction and driver type.
Q2: Why is the distribution factor different for men and women?
A: Women typically have a higher percentage of body fat and lower percentage of water, leading to higher BAC levels from the same amount of alcohol.
Q3: How accurate is the Widmark formula?
A: It provides a reasonable estimate but doesn't account for individual variations in metabolism, food consumption, or drinking pace.
Q4: What factors affect BAC besides amount consumed?
A: Body composition, metabolism rate, food intake, medication, fatigue, and drinking speed all influence actual BAC levels.
Q5: How long does it take for alcohol to leave the system?
A: The body metabolizes alcohol at about 0.015% per hour on average, but this varies by individual.