BAC Calculator
Estimate your Blood Alcohol Content with the Widmark formula. Add beers, wines, or shots and set hours elapsed. Estimate only.
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Estimated BAC
0.011%
Sober
Approximate time until your BAC reaches zero: 0.7 hours (assuming a metabolism rate of 0.015 per hour).
Legal disclaimer
This is an estimate only. The Widmark formula does not account for food intake, medications, individual metabolism, or measurement error. Do not use this calculator to decide if you can drive. If you have been drinking, do not drive. The only safe BAC for driving is 0.00.
Frequently Asked Questions about the BAC Calculator
What formula does this calculator use?
The Widmark formula: BAC% = (alcohol oz x 5.14) / (weight lb x r) minus (0.015 x hours since first drink). The distribution ratio r is 0.66 for men and 0.55 for women, reflecting average body water content.
What is the US legal limit for driving?
0.08% BAC for drivers 21 and older in all 50 US states. Utah uses 0.04%. Commercial drivers face 0.04%, and drivers under 21 face zero tolerance laws in most states (0.00 to 0.02%).
Can I rely on this to decide if I can drive?
No. This is an estimate only and can be off by a wide margin depending on food, medications, hydration, fatigue, and individual metabolism. If you have been drinking, do not drive. The only safe BAC behind the wheel is 0.00.
How fast does the body process alcohol?
The liver clears alcohol at roughly 0.015 BAC per hour for most adults. Coffee, cold showers, and food do not speed this up. Only time lowers your BAC.
Why do men and women metabolize alcohol differently?
Women on average have a lower body water percentage than men, so the same amount of alcohol reaches a higher concentration in the bloodstream. Widmark uses r = 0.55 for women and 0.66 for men to reflect this.
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