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Drinking and BAC-how to calculate

post #1 of 4
7/16/08 at 2:17am
Thread Starter 
Is there any way to accurately track your blood alcohol content (concentration?) during a night out? I have always heard "1 drink per hour" keeps you under the legal limit, but it seems like there must be many variables. Such as your weight, how much you have eaten, how high your tolerance is, etc....

Hypothetically, if I am 160 lbs., and drink 3 beers between 6 and 9 pm, and then drive and get pulled over at 9:05 for a bad taillight, what is my BAC likely to be? Is it zero, because I had three drinks in three hours? Or is it 0.079, just under the 0.08 limit?

Can anyone offer insight on this? There are often checkpoints in town, and although I bike when possible, I don't want to be in a bad situation because I underestimated my BAC.
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post #2 of 4
7/16/08 at 2:24am
You said it yourself, there are too many variables. IMO, the best way to find out would be to buy a personal breathalizer, you can find a decent one for about 70 bucks. Cheaper than a DUI, that's for sure...
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post #3 of 4
7/16/08 at 2:44pm
There is a formula to ROUGHLY calculate your blood alcohol level, after that it just depends on what your country or state will allow..

BAC= (10*standard units)/(weight in kg*(0,7 for men, 0,5 for women)) - (number of hours since first glass - 0,5) * Weight in kg * 0,002

and if you're not into math :

http://www.ou.edu/oupd/bac.htm
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post #4 of 4
7/16/08 at 7:27pm
Thread Starter 
That is really useful, but I'm kind of surprised how LOW the BAC turned out to be for my hypothetical example. I wonder what the +/- is on the percentage.

Thanks.
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