Believe it or not, there are FIVE iPhone applications all custom designed to calculate your blood alcohol levels.  Let's say you're sober enough to properly input all of the data necessary to accurately calculate your BAC.  Let's assume you remember everything you drank tonight. Let's even assume you know exactly what you weigh.  Do you think any policeman on the planet is going to use your iPhone calculations to pardon you from that DWI ticket?  Probably not.  Having said that, these apps (which all run for under $5) can provide some entertainment at parties.  Hell, who doesn't want to know the estimated BAC of a 110 lb. girl after drinking three Bud Lights?

DrinkBuddy and Drunkulator

These two apps come from the same developer, John Moff, and seem to be nearly identical at their core.  For an extra two dollars, you can purchase DrinkBuddy, which keeps track of exactly what you drank AND gives you the option to catalog the drinking habits of your friends.  So, the next time your buddy claims he out drank you, all you have to do is pull out your iPhone complete with their drinking history.

Both DrinkBuddy and Drunkulator have BAC calculators, but the much more detailed version on DrinkBuddy comes complete with pre-calculated drinks, the ability to take photos of your exploits, and email the results back to yourself after you've detached your face from the bathroom floor.

Bar Hopper

Two cases of Coors Light into the night, you're sure you can pick up Joey C. and his crew  at the Crazy Donkey.  Somehow, though, instead of packing your yellow Hummer with the boys, you've ended up on the Nassau County DWI Wall of Shame.  But, how could this horrible fate be avoided?

You could have purchased Bar Hopper for your iPhone, which calculates your approximate blood alcohol level based on your weight, sex, and number of drinks.  Honestly, this sounds a little dicey to us, but maybe it'll discourage a potential drunk driver from hitting the streets (and virtually everything else in their way).   Bar Hopper also has a built in taxi finder, which might actually be the best feature of the application.

Drink Timer

Possibly the simplest of all of the breathalyzer substitute applications, Drink Timer counts down the seconds until you're sober again.  Is it me or does that just sound like a downer?

R U Drunk

The folks at MobilityWare don't want to just calculate your blood alcohol levels.  No, they want to embarrass you with a built in field sobriety test.  Using the iPhone's built in censors and touch screen, R U Drunk puts your balance, hand eye coordination, ability to draw a straight line, and alphabet skills on trial.