A friend just asked me this question and I directed her to this Martha Party Calculator. Sarah used this formula for her wedding and we have used it for events we’ve catered and it has not let us down. Running out of alcohol at a party is never a good thing.

Follow this guide to determine how much to buy. The primary rule: Buy plenty. You can use it later or return unopened bottles (check store policy before making your purchase).

Item and Quantity

Wine: One bottle per two people per hour

Beer: Two per person per hour

Spirits: One bottle per five people per hour

Mixers: Three bottles for each bottle of alcohol

Ice: At least one pound per person per hour

xo,
Lydia