I hafta find out what I weigh. Haven't been on a scale in ages. But after a tiny bit of drink you gotta do the safe thing - hand over keys to a trusted friend who didn't have anything at all, wait awhile before leaving and eat food, anything that eliminates risk entirely for your situation, even if under the legal limit.
My rule is, if I have more than 2, I don't drive. I think it's silly to not drive just because you had one beer. I mean if you came with someone who didn't drink, then it doesn't hurt to let them drive, but 1 or 2 is not going to affect me. I mean the calculator said I could drink 5 and still be under the limit after an hour! LOL!