FORMULA

THE FORMULA FOR CALCULATING ALCOHOL  CONTENT
1. DETERMINE THE NUMBER OF *DRINKS YOU HAD                            =  
2. DETERMINE YOUR BODY WEIGHT AT THE TIME OF DRINKING   =  
3. FIND THE INTERSECTION OF YOUR NUMBER OF DRINKS WITH YOUR BODY WEIGHT USING THE CHART BELOW                               =  
4. RECORD THE NUMBER OF HOURS OVER WHICH YOU DRANK      =  
5. MULTIPLY THE NUMBER OF HOURS OVER WHICH YOU DRANK TIMES .015% (THIS REPRESENTS THE BURNOFF RATE OF ALCOHOL)                                                                                                        =  
6. SUBTRACT THE BURN OFF ALCOHOL FROM THE CHART LEVEL OF ALCOHOL.                                                                                                (-)  
7. YOUR APPROXIMATE BREATH OR BLOOD ALCOHOL.                      =

(*1 drink = one 12 oz. Beer, one ounce of 100 proof liquor, or one 5 oz. glass of wine.)

EXAMPLE:

EXAMPLE FOR CALCULATING ALCOHOL  CONTENT
1. DETERMINE THE NUMBER OF *DRINKS YOU HAD                              = 3 BEERS
2. DETERMINE YOUR BODY WEIGHT AT THE TIME OF DRINKING     = 150 LBS
3. FIND THE INTERSECTION OF YOUR NUMBER OF DRINKS WITH YOUR BODY WEIGHT USING THE CHART BELOW                                = .075
4. RECORD THE NUMBER OF HOURS OVER WHICH YOU DRANK       = 2
5. MULTIPLY THE NUMBER OF HOURS OVER WHICH YOU DRANK TIMES .015% (THIS REPRESENTS THE BURNOFF RATE OF ALCOHOL)                                                                                                         = .030
6. SUBTRACT THE BURN OFF ALCOHOL (#5) FROM THE CHART LEVEL OF ALCOHOL. (#3 ) TO ARRIVE AT YOUR APPROXIMATE BREATH OR BLOOD ALCOHOL LEVEL                                                   (-) -.030
7. THE CALCULATION TOTAL IS WELL WITHIN THE LEGAL LIMITS  = .045
 

 

 

DRINKS
Body weight 1 2 3 4 5 6 7 8 9 10 11 12
100 lb. .038 .075 .113 .150 .188 .225 .263 .300 .338 .375 .413 .450
110 lb. .034 .066 .103 .137 .172 .207 .241 .275 .309 .344 .379 .412
120 lb. .031 .063 .094 .125 .156 .188 .219 .250 .281 .313 .344 .375
130 lb. .029 .058 .087 .116 .145 .174 .203 .232 .261 .290 .320 .348
140 lb. .027 .054 .080 .107 .134 .161 .188 .214 .241 .268 .295 .321
150 lb. .025 .050 .075 .100 .125 .151 .176 .201 .226 .251 .276 .301
160 lb. .023 .047 .070 .094 .117 .141 .164 .188 .211 .234 .258 .281
170 lb. .022 .045 .066 .088 .110 .132 .155 .178 .200 .221 .244 .265
180 lb. .021 .042 .063 .083 .104 .125 .146 .167 .188 .208 .229 .250
190 lb. .020 .040 .059 .079 .099 .119 .138 .158 .179 .198 .217 .237
200 lb. .019 .038 .056 .075 .094 .113 .131 .150 .169 .188 .206 .225
210 lb. .018 .036 .053 .071 .090 .107 .125 .143 .161 .179 .197 .215
220 lb. .017 .034 .051 .068 .085 .102 .119 .136 .153 .170 .188 .205
230 lb. .016 .032 .049 .065 .081 .098 .115 .130 .147 .163 .180 .196
240 lb. .016 .031 .047 .063 .078 .094 .109 .125 .141 .156 .172 .188
[Created from NHTSA chart, with modifications]
 

 

 
 
  

NOTES

  1. BAC Calculator

 

Samuel S. Shapiro
Attorney at Law
4334 East Third St.
Bloomington, IN 47401
(812) 336-8192
 office@samshapiro.com

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