EBAC: Estimated Blood Alcohol Content by Intake Calculator

Online EBAC calculator to calculate estimated blood alcohol content by intake using simple blood alcohol concentration formula.

Blood alcohol content (BAC), also called blood alcohol concentration, blood ethanol concentration, or blood alcohol level, is most commonly used as a metric of alcohol intoxication for legal or medical purposes. Blood Alcohol Content is the legal name for BAC but Blood Alcohol Concentration is sometimes used for simpler description.

Metabolism Rate

MeanRange
Male0.0180.0102-0.0253
Female0.0170.014-0.021

Standard drink chart (U.S.)
AlcoholAmount (ml)Amount (fl oz)Serving sizeAlcohol (% by vol.)Alcohol
80 proof liquor441.5One shot400.6 US fl oz (18 ml)
Table wine1485One glass120.6 US fl oz (18 ml)
Beer35512One can/bottle50.6 US fl oz (18 ml)

Formula:

EBAC0.806×SD×1.2BW×Wt-MR×DP

where,

0.806 is a constant for body water in the blood,
SD is the number of standard drinks containing 10 grams of ethanol,
1.2 is a factor to convert the amount in grams to Swedish standards set by The Swedish National Institute of Public Health,
BW is a body water constant,
Wt is body weight (kilogram),
MR is the metabolism constant (0.017),
DP is the drinking period in hours,
10 converts the result to permillage of alcohol.

Reference:

Wikipedia: https://en.wikipedia.org/wiki/Blood_alcohol_content

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