Blood alcohol content is the concentration of alcohol in the blood stream.
Every state has a legal BAC limit of 0.08% for drivers over the age of 21.
There is no way to definitively calculate BAC without a blood test, but certain equations can estimate levels based on weight and sex.
Wolfram Alpha offers a calculator to estimate your blood alcohol level after you've had a night on the town.
It is only an estimate and will never be accurate enough to judge whether you're legal to drive. The calculator doesn't take into account differences such as metabolism and medication.
Tonight at 10: We put smartphone breathalyzers to the test and find out which devices are most accurate.
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