Only a "few drinks" cost me my license!
This can be best answered by using NHTSA's own training materials.
Their example: a 175 lb man* has two beers close in time and on an empty stomach. His BAC will be slightly above .04. Two more and he is at .08. The BAC gets higher quicker with continued drinking. NHTSA also measures the average burn time per hour.
Now you know more than anyone else you're drinking with!
Drink responsibly and hire a DUI attorney if arrested under the suspicion of an alcohol related offense.
*I'll write more later on the effects of alcohol on the different genders
and what a "drink" is.