Estimated BAC Calculator

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Blood alcohol content (BAC) is the amount of alcohol measured in someone's blood. New York DWI laws define driving while intoxicated as driving with a BAC level of .08% or higher. An individual's BAC may be calculated through numerous forms of chemical tests to prove intoxication.

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Estimated BAC Calculation

No blood alcohol calculator can be trusted entirely as a sole indicator of your blood alcohol content and your ability to drive. Many factors, such as age, metabolism level, gender, medications, food in your stomach, and other factors may alter your actual BAC. However, your estimated blood alcohol content can be calculated by following these directions:

• Locate your weight in the chart below and the corresponding number of drinks which you have had thus far.
• As alcohol burns up over time as your body metabolizes, it is necessary to subtract the alcohol burned over time from the number in the chart. In most people, alcohol is burned off at a rate of .015% per hour.

Example: If you weigh 160 pounds and have had 4 drinks in 3 hours, you would calculate your estimated BAC as follows:

• 160 pound individual having 3 drinks = .094% (from chart below)
• Multiply: .015 x 3 to get percent of alcohol burned off = .045%
• Subtract: .094% - .045%
• Estimated BAC: .049

Note from editor: Let's discuss on the development call what type of chart to use on this page (interactive or static) and what the source of the chart should be.

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