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How To Calculate Your Estimated Blood Alcohol Content / BAC

Showing estimated percent of alcohol in the blood by number of drinks in relation to body weight. This percent can be estimated by:

  1. Count your drinks (1 drink equals 1 ounce of 100-proof liquor, one five ounce glass of table wine or one 12-ounce bottle of regular beer).

  2. Use the chart below and under number of "drinks" and opposite "body weight" find the percent of blood alcohol listed.

  3. Subtract from this number the percent of alcohol "burned up" during the time elapsed since your first drink. This figure is .015% per hour. (Example: 180 lb. man - 8 drinks in 4 hours / .167% minus (.015x4) = .107%
  NUMBER OF 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

[Created from NHTSA chart, with modifications]

DISCLAIMER: This calculator is for entertainment and informational purposes only. The information on this site is NOT LEGAL ADVICE. Your actual blood alcohol concentration depends on a variety of additional factors, like genetic makeup, personal health, and recent food consumption. These results are rough estimates for an average person only. Do not rely on these results to drive or work. Never drink and drive.