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Blood Alcohol Calculator (BAC)
Your Estimated BAC
0.00%
DISCLAIMER: For educational purposes only. Do not drink and drive.
Formula (Widmark):
BAC = (Alcohol in grams / (Body weight in kg × Gender Constant)) × 100 - (0.015 × hours)
Gender Constant: Male = 0.68, Female = 0.55
BAC = (Alcohol in grams / (Body weight in kg × Gender Constant)) × 100 - (0.015 × hours)
Gender Constant: Male = 0.68, Female = 0.55
Examples
- Example 1: 70kg Male, 2 beers in 1 hour → ~0.04% BAC.
- Example 2: 60kg Female, 3 wines in 2 hours → ~0.10% BAC.
- Example 3: 80kg Male, 1 spirit in 0.5 hours → ~0.01% BAC.
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Frequently Asked Questions
What is the legal driving limit?
In most of the US and UK it is 0.08%. In some countries (Saudi Arabia, UAE) it is 0.00%.
How long does alcohol stay in my system?
On average, the body metabolizes alcohol at a rate of 0.015% BAC per hour.
Why does gender matter?
Men generally have more body water and a different ratio of fat to lean mass, affecting alcohol dilution.
Is this calculator 100% accurate?
No, this is only an estimate based on averages. Actual BAC can vary based on food intake, genetics, and health.