Estimated Blood Alcohol Content Formula

Equation for calculate estimated blood alcohol content is,

$EBAC\approx \left(\frac{0.806\times SD\times 1.2}{BW\times Wt}-MR\times DP\right)$

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.