Loyola University Maryland

Alcohol and Drug Education and Support Services, & Health Promotion

Calculate Your Blood Alcohol Level

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Understanding BAC

How do you know the right amount for you? We recommend that you check out a BAC (blood alcohol concentration) calculator and make sure that your BAC stays in the Green Zone (between .00-.06)

BAC (Blood Alcohol Concentration) is the percentage of your blood volume that is alcohol. The more you drink, the more your BAC increases.

BAC Calculator 

This calculator will help you make a calculation for your BAC. Step One identify if you are male or female. Step Two put in how many 12 oz (can) of beer, 5 oz (small glass) of wine, 1.5 oz (shot) of hard liquor you consumed. Step Three put in over how long a period of time you consumed alcohol. Step Four put in your body weight. This will provide you with an estimated BAC.  Below you will also find BAC charts to help with this calculation as well.

Estimating Blood Alcohol Concentration (Based on Weight and Gender)

Males

 

 Weight  Drinks
 
 1
 2


 5
6
 7 8 9
10
 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  .17

 

Females

 Weight Drinks
   1 2
 3  4 5
 6 7
 8  9  10
 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  .2 

Time Factor Table

 

Hours since first drink  1
 2 3
4
 5 6
Subtract from BAC  .015 .030
.045
.060
.075
.0
 

What do these numbers mean?

Blood Alcohol
Concentration
Changes in Feelings
and Personality
Physical and Mental
Impairments
0.01 — 0.06 Relaxation
Sense of Well-being
Loss of Inhibition
Lowered Alertness
Joyous
Thought
Judgment
Coordination
Concentration
0.06 — 0.10 Blunted Feelings
Disinhibition
Extroversion
Impaired Sexual Pleasure
Reflexes Impaired
Reasoning
Depth Perception
Distance Acuity
Peripheral Vision
Glare Recovery
0.11 — 0.20 Over-Expression
Emotional Swings
Angry or Sad
Boisterous
Reaction Time
Gross Motor Control
Staggering
Slurred Speech
0.21 — 0.29 Stupor
Lose Understanding
Impaired Sensations

Severe Motor Impairment
Loss of Consciousness
Memory Blackout

0.30 — 0.39 Severe Depression
Unconsciousness
Death Possible
Bladder Function
Breathing
Heart Rate
=> 0.40 Unconsciousness
Death
Breathing
Heart Rate

Green Zone

Green Zone