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How to Estimate Your Blood Alcohol Level

How to Estimate Your Blood Alcohol Level

You can estimate the percent of alcohol in the blood by the number of drinks in relation to body weight. You should remember this is just an estimate. Many factors such as amount and type of food consumption, prior exposure to alcohol, medical issues, gender differences, and time of consumption can change the calculations up or down. To make an estimate:

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

2. Use the following chart and under number of “drinks” and opposite “body weight” find the percent of blood alcohol listed.

DRINKS
Body
Weight (lbs)
123456789101112
100.038.075.113.150.188.225.263.300.338.375.413.450
110.034.066.103.137.172.207.241.275.309.344.379.412
120.031.063.094.125.156.188.219.250.281.313.344.379
130.029.058.087.116.145.174.203.232.261.290.320.348
140.027.054.080.107.134.161.188.214.241.268.295.321
150.025.050.075.100.125.151.176.201.226.251.276.301
160.023.047.070.094.117.141.164.188.211.234.258.281
170.022.045.066.088.110.132.155.178.200.221.244.265
180.021.042.063.083.104.125.146.167.188.208.229.250
190.020.040.059.079.099.119.138.158.179.198.217.237
200.019.038.056.075.094.113.131.150.169.188.206.225
210.018.036.053.071.090.107.125.143.161.179.197.215
220.017.034.051.068.085.102.119.136.153.170.188.205

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 has 8 drinks in 4 hours / .167% minus (.015x4) = .107 %)

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