Blood Alcohol Concentration

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Blood/Breath Alcohol Concentration (BAC) is the amount of alcohol in the bloodstream or on one’s breath. BAC is expressed as the weight of ethanol, measured in grams, in 100 milliliters of blood, or 210 liters of breath. BAC can be measured by breath, blood, or urine tests.

The number of drinks consumed is a very poor measure of intoxication largely because of variation in physiology and individual alcohol tolerance.
There is much variation according to:

  • body weight
  • sex
  • body fat percentage even between gender

Neither BAC, nor the number of drinks consumed, are necessarily accurate indicators of the level of impairment. Tolerance to alcohol also varies from one person to another, and can be affected by such factors as genetics, adaptation to chronic alcohol use, and synergistic effects of drugs.

In the state of Indiana, as in most states, you are legally intoxicated at a BAC of .08, no matter your age.

Estimating Blood Alcohol Levels

BAC Level Generalized Dose Specific Effects
0.020-0.039% No loss of coordination, slight euphoria and loss of shyness. Relaxation, but depressant effects are not apparent.
0.040-0.059% Feeling of well being, relaxation, lower inhibitions, and sensation of warmth. Euphoria. Some minor impairment of judgment and memory, lowering of caution.
0.06-0.099% Slight impairment of balance, speech, vision, reaction time, and hearing. Euphoria. Reduced judgment and self-control. Impaired reasoning and memory.
0.100-0.129% Significant impairment of motor coordination and loss of good judgment. Speech may be slurred; balance, peripheral vision, reaction time, and hearing will be impaired.
0.130-0.159% Gross motor impairment and lack of physical control. Blurred vision and major loss of balance. Euphoria is reducing and beginning dysphoria (a state of feeling unwell)
0.160-0.199% Dysphoria predominates, nausea may appear. The drinker has the appearance of a sloppy drunk.
0.200-0.249% Needs assistance in walking; total mental confusion. Dysphoria with nausea and vomiting; possible blackout.
0.250-0.399% Alcohol poisoning. Loss of consciousness.
0.40% + Onset of coma, possible death due to respiratory arrest.

Estimating Blood Alcohol Level (Based on Weight)

Males

Weight 1 drink 2 drinks 3 drinks 4 drinks 5 drinks 6 drinks 7 drinks 8 drinks 9 drinks 10 drinks
100 lbs .043 .087 .130 .174 .217 .261 .304 .348 .391 .435
125 lbs .034 .069 .103 .139 .173 .209 .242 .278 .312 .346
150 lbs .029 .058 .087 .116 .145 .174 .203 .232 .261 .290
175 lbs .025 .050 .075 .100 .125 .150 .175 .200 .225 .250
200 lbs .022 .043 .065 .087 .108 .130 .152 .174 .195 .217
225 lbs .019 .039 .058 .078 .097 .117 .136 .156 .175 .195
250 lbs .017 .035 .052 .070 .087 .105 .122 .139 .156 .173

Females

Weight 1drink 2 drinks 3 drinks 4 drinks 5 drinks 6 drinks 7 drinks 8 drinks 9 drinks 10 drinks
100 lbs .050 .101 .152 .203 .253 .304 .355 .406 .456 .507
125 lbs .040 .080 .120 .162 .202 .244 .282 .324 .364 .404
150 lbs .034 .068 .101 .135 .169 .203 .237 .271 .304 .338
175 lbs .029 .058 .087 .117 .146 .175 .204 .233 .262 .292
200 lbs .026 .050 .076 .101 .126 .152 .177 .203 .227 .253
225 lbs .022 .045 .068 .091 .113 .136 .159 .182 .204 .227
250 lbs .020 .041 .061 .082 .101 .122 .142 .162 .182 .202

Time Factor Table

Hours since first drink 1 2 3 4 5 6
Subtract from blood alcohol level .015 .030 .045 .060 .075 .090

You can use this link to access our BAC calculator. Please remember this is an estimation and not an exact science.
BAC Calculator