Bac Chart

Estimated Blood Alcohol Concentration After One Hour

Number of DrinksBody Weight (Pounds)
100120140160180200220240
1.04.03.03.02.02.02.02.02
2.06.06.05.05.04.04.03.03
3.11.09.08.07.06.06.05.05
4.15.12.11.09.08.08.07.06
5.19.16.13.12.11.09.09.08
6.23.19.16.14.13.11.10.09
7.26.22.19.16.15.13.12.11
8.30.25.21.19.17.15.14.13
9.34.28.24.21.19.17.15.14
10.38.31.27.23.21.19.17.16

A good rule of thumb is that one drink is metabolized to the point of elimination from the blood stream each hour. Therefore, typically, if you have one drink, waiting one hour before driving is a good idea. Remember there are other factors that influence and can increase or decrease one's breathalyzer concentration such as fatigue, having eaten, and the type of drink.