I don't like calculators, but I don't like people getting screwed -- the overpayers OR the folks on a tight budget who might not be able to go if someone orders crazywine and the most expensive item on the menu. With some groups, it's easiest just to divide by X. With other groups, it works better to have each pay for his/her own stuff. But you really need to know your group. The last big group lunch I went to ended up being way under on the bill. WTF. It's so embarassing to have to do the "um, guys...we're short" thing.