Blood Alcohol Calculator
⚠️ This calculator is for educational purposes only. Do not use it to determine if you are safe to drive. Always use designated drivers or alternative transportation when consuming alcohol.
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Alcohol Consumption
Blood Alcohol Calculator
Our Blood Alcohol Content (BAC) calculator uses the scientifically proven Widmark formula to estimate your blood alcohol level based on your weight, gender, alcohol consumption, and time elapsed. This tool helps you understand how alcohol affects your body and provides educational information about alcohol metabolism.
What is Blood Alcohol Content (BAC)?
Blood Alcohol Content (BAC) is a measure of the amount of alcohol in your bloodstream. It's expressed as a percentage, representing the grams of alcohol per 100 milliliters of blood. BAC is used worldwide to determine legal intoxication levels for driving and other activities. The legal limit varies by country, but commonly ranges from 0.05% to 0.08%.
How to Calculate Blood Alcohol Content?
BAC = (A / (r × W)) - (β × t)
Where:
A = Alcohol consumed (grams)
r = Distribution ratio (0.68 for men, 0.55 for women)
W = Body weight (kg)
β = Elimination rate (0.015 per hour)
t = Time since drinking (hours)Example: A 70kg male who consumed 28g of alcohol (2 standard drinks) 2 hours ago would have an estimated BAC of: (28 / (0.68 × 70)) - (0.015 × 2) = 0.589 - 0.03 = 0.559% BAC
Frequently Asked Questions
How accurate is this BAC calculator?
This calculator uses the Widmark formula, which is scientifically recognized but provides estimates only. Actual BAC can vary based on factors like food consumption, medications, health conditions, and individual metabolism. For legal or medical purposes, only professional breathalyzer or blood tests are accurate.
What factors affect blood alcohol content?
Several factors influence BAC including body weight, gender, amount of alcohol consumed, time period of consumption, food intake, medications, health conditions, and individual metabolism rates. Women typically have higher BAC than men when consuming the same amount of alcohol due to differences in body composition.
How long does it take for alcohol to leave your system?
On average, the human body eliminates alcohol at a rate of about 0.015% BAC per hour. This means it takes approximately one hour to process one standard drink. However, this rate can vary significantly between individuals and is affected by various factors including liver health, age, and genetics.
What is considered a standard drink?
A standard drink contains approximately 14 grams of pure alcohol. This equals: 12 oz of beer (5% alcohol), 5 oz of wine (12% alcohol), or 1.5 oz of spirits (40% alcohol). Different countries may have slightly different standard drink definitions, but 14g is widely used internationally.
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