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BAC Calculator Tool

Your Information
lbs
▼
Please enter your body weight.
hrs
Drinks Consumed
▼
▼
%
oz
Estimated BAC Result
0.000
grams per deciliter (g/dL)
0.000.08 (Legal Limit)0.40+
0
Standard Drinks
0h
Est. Time to 0.00
⚠ Important Disclaimer

This calculator provides an estimate only and should never be used to determine whether you are fit to drive. Actual BAC depends on many factors including metabolism, food intake, medications, and individual physiology. When in doubt, do not drive.

If you are facing DUI charges, understanding your BAC is critical to your defense strategy. Learn more about what BAC is and how it impacts your case.

Medical & Legal Sources

The calculations in this tool are based on the following published medical research and legal standards. These sources are widely used in forensic toxicology and DUI defense proceedings.

  1. Widmark, E.M.P. (1932). Die theoretischen Grundlagen und die praktische Verwendbarkeit der gerichtlich-medizinischen Alkoholbestimmung. Berlin: Urban & Schwarzenberg. — The foundational formula for estimating blood alcohol concentration based on body weight, gender, alcohol consumed, and time elapsed.
  2. Posey, D. & Mozayani, A. (2007). "The estimation of blood alcohol concentration: Widmark revisited." Forensic Science, Medicine and Pathology, 3(1), 33–39. PubMed 25868887
  3. Maskell, P.D. et al. (2015). "Alcohol calculations and their uncertainty." Forensic Science International, 249, 291–300. National Institutes of Health. PMC 4361698
  4. National Institute on Alcohol Abuse and Alcoholism (NIAAA). "What Is A Standard Drink?" — Defines a U.S. standard drink as any beverage containing 14 grams (0.6 fl oz) of pure alcohol. niaaa.nih.gov
  5. Centers for Disease Control and Prevention (CDC). "About Standard Drink Sizes." cdc.gov
  6. California Vehicle Code § 23152(b). "It is unlawful for a person who has 0.08 percent or more, by weight, of alcohol in their blood to drive a vehicle." leginfo.legislature.ca.gov
Parameters Used in This Calculator
  • Widmark r-factor: 0.68 (male), 0.55 (female)
  • Alcohol elimination rate (β): 0.015 g/dL per hour (population average)
  • Standard drink equivalent: 14 grams of pure ethanol (NIAAA)
  • Ethanol density: 0.789 g/mL
  • Per se legal limit (California): 0.08% BAC — Cal. Veh. Code § 23152(b)
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