The background to this calculator and
the formulas used to calculate BAC are from
Chapter 10, Alcohol and Traffic Safety
of Traffic Safety
How to purchase
Table of Contents
*The estimates are based on drinks containing 0.5
fluidounces (15 mL) of alcohol, close to a typical serving of beer, wine, or
spirits. The same amount of alcohol consumed in the same time produces
approximately the same BAC, regardless of the type of drink. About 0.5
fluidounces of alcohol is contained in a typical serving of beer (12
fluidounces), of wine (4 fluidounces,) or scotch (1.3 fluidounces -- although
a common measure is 1.5 fluidounces) or other similar strength liquor.
These are typical estimates. The BAC reached by an individual may vary
for many reasons, including food consumption. The performance and behavior
changes at a given BAC vary substantially between individuals. This
calculation is a guide based on average responses. There is no guarantee that
you will be measured to be within legal limits even if the calculation
indicates that you are marginally legal.
Blood Alcohol Concentration
(BAC) is the percent, by weight, of alcohol in the blood. It is illegal to
drive with a BAC exceeding an amount specified in law. Legal limits vary -
from 0.02% in Sweden to 0.08% in all US states (as of November 2005).