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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. The average alcohol
burn off rate per hour ranges from .010% to .020%. Experts
often assume a burn off rate of .015% per hour. (Example: 180 lb. man - 8 drinks in 4 hours / .167% minus
(.015x4) = .107 %
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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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