Alcohol Impairment Chart

Females

Approximate Blood Alcohol Percentage

Drinks*

Body Weight in Pounds

Effect on Person
 

90

100

120

140

160

180

200

220

240

  

0

.00

.00

.00

.00

.00

.00

.00

.00

.00

ONLY SAFE DRIVING LIMIT.

1

.05

.05

.04

.03

.03

.03

.02

.02

.02

Impairment begins.

2

.10

.09

.08

.07

.06

.05

 .05

.04

.04

Driving skills significantly affected.
POSSIBLE CRIMINAL PENALTIES.

3

.15

.14

.11

.11

.09

.08

.07

.06

.06

4

.20

.18

.15

.13

.11

.10

.09

.08

.08

5

.25

.23

.19

.16

.14

.13

.11

.10

.09

6

.30

.27

.23

.19

.17

.15

.14

.12

.11

LEGALLY INTOXICATED.†
CRIMINAL PENALTIES IMPOSED.

7

.35

.32

.27

.23

.20

.18

.16

.14

.13

8

.40

.36

.30

.26

.23

.20

.18

.17

.15

9

.45

.41

.34

.29

.26

.23

.20

.19

.17

10

.51

.45

.38

.32

.28

.25

.23

.21

.19

Subtract .01 for each 30 to 40 minutes of drinking.

* One drink is equal to 1½ oz. of 80 proof liquor, 12 oz. of beer, 4 to 5 oz. of unfortified table wine, or 4 oz. liqueur.
† In some States, the limit for legal intoxication is .08.

Males

Approximate Blood Alcohol Percentage

Drinks*

Body Weight in Pounds

Effect on Person
 

100

120

140

160

180

200

220

240

  

0

.00

.00

.00

.00

.00

.00

.00

.00

ONLY SAFE DRIVING LIMIT.

1

.04

.03

.03

.02

.02

.02

.02

.02

Impairment begins.

2

.08

.06

.05

.05

.04

.04

.03

.03

3

.11

.09

.08

.07

.06

.06

.05

.05

Driving skills significantly affected.
POSSIBLE CRIMINAL PENALTIES.

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

LEGALLY INTOXICATED.†
CRIMINAL PENALTIES IMPOSED.

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

Subtract .01 for each 30 to 40 minutes of drinking.

* One drink is equal to 1½ oz. of 80 proof liquor, 12 oz. of beer, 4 to 5 oz. of unfortified table wine, or 4 oz. liqueur.
† In some States, the limit for legal intoxication is .08.