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Like this design? Create an Evite invitation with this image.

Picture this: You're having a big party. (A New Year's Eve party, perhaps?) You're standing in the liquor store with a basket full of bottles, but you have no idea how much will actually suffice. You overbuy, fearing what would happen if you ran out mid-party. After the party, you've got enough alcohol left to supply a medium-sized happy hour. Well, meet your new best friend — the Evite Drink Calculator.

Here's how it works:

1. Plug in how many hours you're expecting your party to last.
2. Enter the number of guests who are coming. (You can divide them by how heavily they drink, or just put your total guest count in "Average Drinkers" — it usually evens out.)
3. Check off the type of drinks you're serving.

The Drink Calculator spits out an astoundingly accurate tally of how many bottles of what you should buy. Genius!