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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 %
 
Drinks
Body weight
(lbs.)
1 2 3 4 5 6 7 8 9 10 11 12
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 .375
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
230 .016 .032 .049 .065 .081 .098 .115 .130 .147 .163 .180 .196
240 .016 .031 .047 .063 .078 .094 .109 .125 .141 .156 .172 .188

The Drink Wheel
On-Line BrAC Calculator
About Disclaimer

I have had over a period of hour(s)2.

I am Male Female (Explanation of gender differences in Blood Alcohol Concentration)

and I weigh Pounds Kilograms

and I live in (so that the result is displayed in the appropriate units).



About the Drink Wheel

The Intoximeters Inc. "Drink Wheel"1 is a form that you can fill out. Upon completion we will instantly compute your estimated blood/breath alcohol concentration ("BAC") based on the information that you have provided and return that estimate to you. It is presented as a public service to Intoximeters web site visitors. Its primary purpose is to provide useful information about the responsible use of alcohol.

Why is it called a "Drink Wheel"?

We call it the "Drink Wheel" because it is based on various paper and cardboard BAC calculators that are given out in alcohol awareness programs, some of which are in the form of a wheel that you can spin around to calculate your estimated BAC based on what and how much you have had to drink.

Disclaimer

It would be extremely foolish for us to pretend that our "Drink Wheel" can tell you what your BAC actually is, first because it would open us up to an incredible amount of potential liability and second if it really did work accurately there would be no need for anyone to buy the instruments that we make and sell.

A person's actual BAC is dependent on many complex factors, including their physical condition (body composition, health etc...) and what they have recently ingested (including food, water, medications and other drugs). This site includes a more detailed discussion of the Pharmacology and Disposition of alcohol in humans.

The results that are generated are rough estimates of an average healthy person's BAC assuming typical beverage sizes, recipes and alcohol content. The BAC estimates generated by the Drink Wheel should not be used to infer anyone's fitness to work, drive or perform any other task or duty.


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