How long does alcohol stay in the body?

Factors which affect blood alcohol concentration (BAC) are the metabolism of the person, their general health, how much they have had to eat and how much they have had to drink, amongst others.

The rate at which alcohol is metabolized is the same for virtually everyone regardless of their height, weight, sex, race or other such characteristics. Alcohol is metabolized at the rate of about .015 of BAC every hour. Thus, for example, a person with a very high BAC of .15 will have no measurable alcohol in the bloodstream after ten hours (.15 divided by .015 = 10).