How Much Alcohol Should I Buy for My Event? (Calculator Guide)
Quick Answer: For a typical event, plan on about one drink per guest for the first hour and one more per guest for each additional hour. A common starting point is to split purchases roughly by preference at your event and to buy a little extra to be safe. As a rough guide, one 750ml bottle of spirits makes about 16 cocktails, one bottle of wine pours about 5 glasses, and a case of beer covers 24 servings. Treat these as general ranges rather than an exact quote.
How to Estimate Total Drinks
Start with your guest count and event length. A widely used planning rule is one drink per guest for the first hour, then one drink per guest for every hour after that. For a four-hour party with 100 guests, that works out to roughly 400 to 500 drinks total, and it is smart to round up so you do not run short. Consider your crowd too, since some groups drink more slowly and others more quickly.
Splitting Between Beer, Wine, and Cocktails
Once you have a total, divide it by what your guests are likely to enjoy. A frequent starting split is a portion for cocktails or spirits, a portion for wine, and a portion for beer, adjusted to your crowd. A summer backyard party may lean toward beer and seltzers, while a formal dinner may lean toward wine. When in doubt, buy a balanced mix and keep the receipts so unopened bottles can often be returned.
Bottle and Case Conversion Guide
Converting drinks into bottles is where the math gets practical. One 750ml bottle of spirits yields roughly 16 one-and-a-half-ounce pours, so it covers about 16 cocktails. One standard bottle of wine pours about 5 glasses. A case of beer is 24 servings. Use these conversions to translate your total drink estimate into a concrete shopping list.
Do Not Forget Mixers, Ice, and Non-Alcoholic Options
Alcohol is only part of the list. Plan for sodas, juices, tonic, and other mixers, plus plenty of ice, which is easy to underestimate. A common guideline is one to one-and-a-half pounds of ice per guest, more in hot weather. Always include appealing non-alcoholic options so guests who are not drinking feel included.
When to Choose Dry Hire Instead of Buying Yourself
If estimating and shopping feels overwhelming, a dry-hire bartending service lets you provide the alcohol while professionals handle setup, service, and pacing. Some hosts prefer this because it keeps them in control of the budget while removing the guesswork of service. Others prefer a full-service package where the details are handled end to end.
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Frequently Asked Questions
How much alcohol do I need for 50 guests for 4 hours?
As a rough estimate, plan for around 200 to 250 total drinks, then split that across beer, wine, and cocktails based on your crowd. Round up so you do not run short, and remember unopened bottles can often be returned.
Is it cheaper to buy my own alcohol?
Buying your own alcohol can lower costs, and a dry-hire service lets you supply the drinks while professionals handle the bar. The best choice depends on your budget, guest count, and how much of the planning you want to manage yourself.

