Blood Alcohol Concentration Estimation
 

(Volume ingested in mL x the "proof" of the beverage x 1.463) / (Individual's weight in pounds)

This estimate applies only to a single dose of alcohol (ethanol).

 
The "proof" of the alcoholic beverage
Individual's weight (pounds)
Volume of alcoholic beverage ingested (milliters [mL])
 

This tool calculates the approximate blood alcohol (ethanol, ethyl alcohol) concentration resulting from one drink. The "proof" will be listed on the container of the beverage. The proof is 2 times the alcohol percentage. In other words, 120 proof = 60% alcohol.

The units on the calculated estimate are mg/dL or milligram (mg) %. The legal limit (varies state to state) for driving is 80-100 mg/dL. One ounce = 30 mL.

Rosen et al, eds. Emergency Medicine: Concepts and Clinical Practice. 3rd ed. St. Louis, MO: Mosby; 1992:2521.

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