Guessing how much alcohol you’ll need at your wedding is an imperfect science.

I’ve worked weddings where the couple has warned me “Our guests love to party!” only to end up with cases of unopened wine. I’ve done other weddings where the couple insisted their guests never touched the stuff only to run out of vodka.

To help, I’ve put together a cheat sheet on how much alcohol you will probably need at your wedding. You’ll find it, and other free wedding planning resources, here.

When in doubt — and if your budget can allow for it — order more than you think you’ll need. And don’t forget mixers, garnishes, and non-alcoholic drinks.

Bottoms up.