As far as interactive calculators go, there are delightfully silly ones (this baby name one from Time is a prime—and addictive—example), and then there are ones that might make you want to cry. Slate's latest is the latter, at least for those married folks who spent a pretty penny on their wedding. It's incredibly simple in design: Enter the number of years you've been married and the amount you forked over for your wedding, and it crunches how much money you'd have today if you had invested that cash in the S&P 500 in the year of your marriage instead. See what could have been here. (More wedding stories.)