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BAC Calculator - Blood Alcohol Content
Free BAC calculator. Estimate your blood alcohol content based on drinks, weight, gender, and time. For educational purposes only.
BAC Calculator
Estimate blood alcohol content
Estimated BAC
Enter your values to see results
and click the "Calculate" button
Blood Alcohol Content Calculator
Estimate your BAC based on the Widmark formula. This is for EDUCATIONAL PURPOSES ONLY. Never drive after drinking - even legal BAC levels impair driving.
Widmark Formula
BAC = (Drinks × 0.6) / (Weight × r) - (0.015 × Hours)
r = 0.73 for males, 0.66 for females. Legal limit: 0.08% in most US states.
Frequently Asked Questions
What is the legal BAC limit?
In most US states, 0.08% is the legal limit for drivers 21+. Commercial drivers: 0.04%. Under 21: 0.00-0.02% depending on state.
How accurate is this calculator?
This is an ESTIMATE only. Actual BAC varies based on metabolism, food, medications, and other factors. Never use this to decide if you can drive.
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