Standard Drinks and BAC For every one drink, your BAC goes up by about 0.02 percent, so reaching a BAC of 0.08 percent takes about four to five drinks. However, that does not take into account any of the various factors that contribute to how you process alcohol.

Reaching a Blood Alcohol Concentration (BAC) of 0.08%, the legal driving limit in most of the U.S., typically takes about three to four standard drinks for an average man and two to three standard drinks for an average woman within a one-hour period. However, this is a rough estimate because BAC is influenced by numerous factors including body weight, metabolism, food intake, and age. A "standard drink" is defined as 12 ounces of regular beer (5% ABV), 5 ounces of wine (12% ABV), or 1.5 ounces of distilled spirits (40% ABV). A person weighing 140 pounds will reach the limit much faster than a person weighing 200 pounds because the alcohol is less diluted in their smaller blood volume. Additionally, women generally reach higher BAC levels than men of the same weight due to differences in body composition and enzyme levels. It is important to note that impairment begins well before the 0.08% threshold; coordination and judgment are often significantly affected after just one or two drinks, and many jurisdictions now enforce "warn levels" or lower limits for commercial drivers.