How To Calculate Your Estimated Blood Alcohol Content
(BAC)
Showing estimated percent of alcohol in the
blood by number of drinks in relation to body weight. This
percent can be estimated by:
1. Count your drinks (1 drink equals 1
ounce of 100-proof liquor, one five ounce glass of table
wine or one 12-ounce bottle of regular beer).
2. Use the chart below and under number of
"drinks" and opposite "body weight" find the percent of
blood alcohol listed.
3. Subtract from this number the percent of
alcohol "burned up" during the time elapsed since your
first drink. This figure is .015% per hour. (Example:
180 lb.
man - 8 drinks in 4 hours / .167% minus (.015x4) = .107
%
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