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
%
| |
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]
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