How Much Alcohol for a Party? Easy Rule and Examples

To work out how much alcohol you need for a party, plan about two drinks per drinking guest in the first hour and one drink per hour after that, then split that total between beer, wine and mixed drinks. One beer is one 330 ml bottle or can, a 750 ml bottle of wine gives five 150 ml glasses, and a 700 ml bottle of spirits makes about 17 mixed drinks at 40 ml each. Add around 10% as a buffer, and always plan soft drinks for non-drinkers, water for everyone and plenty of ice. Below is the full method with two worked examples.

The rule of thumb

Drinks per drinking guest = 2 (first hour) + 1 × (number of hours − 1)

Party length	Drinks per drinking guest
2 hours	3
3 hours	4
4 hours	5
5 hours	6
6 hours	7

This is an average for planning, not a target for anyone to drink. Some guests will have far less, a few may have more, and many will alternate with water or soft drinks. Adjust the rule for your crowd: a relaxed dinner usually needs less than a long dance party.

Our party drinks calculator does all of the maths below for you, including water, ice and cups, and lets you change every assumption.

Step 1: Count your drinking guests

Not everyone drinks alcohol. Estimate the share of guests who do, and plan the others into soft drinks.

• Guests: 20
• Share drinking alcohol: about 75%
• Drinking guests: 15
• Non-drinkers: 5

Step 2: Calculate total drinks

Multiply drinking guests by drinks per guest.

For a 4-hour party: 15 × 5 = 75 alcoholic drinks.

Step 3: Split by drink type

Think about what your guests usually drink. A common starting split is 40% beer, 35% wine and 25% mixed drinks, but every crowd is different.

Drink	Share	Drinks
Beer	40%	30
Wine	35%	26.25
Mixed drinks	25%	18.75

Step 4: Convert to bottles

Drink	Serving	Per container
Beer	330 ml	1 serving per bottle or can
Wine	150 ml glass	5 glasses per 750 ml bottle
Spirits	40 ml per mixed drink	About 17 per 700 ml bottle, about 18 per 750 ml bottle
Mixer	About 160 ml per mixed drink	Tonic, cola, juice, soda

Always round up to whole bottles.

Worked example 1: 20 guests, 4 hours

Assumptions: 75% drink alcohol, split 40/35/25, standard serving sizes, plus a 10% buffer.

Item	Calculation	Amount (with 10% buffer)
Alcoholic drinks	15 × 5 = 75	83
Beer	30 × 1.1	33 bottles or cans of 330 ml
Wine	26.25 glasses × 1.1 ≈ 29 glasses	6 bottles of 750 ml
Spirits	18.75 drinks × 1.1 ≈ 21 drinks × 40 ml	2 bottles of 700 ml
Mixers	21 drinks × 160 ml	About 3.5 L
Soft drinks for non-drinkers	5 guests × 5 drinks × 250 ml × 1.1	About 7 L
Water for everyone	20 guests × 4 h × 0.25 L × 1.1	About 22 L
Ice	20 guests × 0.5 kg × 1.1	About 11 kg
Cups	2 per guest × 1.1	44

Worked example 2: 50 guests, 5 hours

Assumptions: 70% drink alcohol, so 35 drinking guests and 15 non-drinkers; same split and serving sizes; 10% buffer.

Item	Calculation	Amount (with 10% buffer)
Alcoholic drinks	35 × 6 = 210	231
Beer	84 × 1.1	93 bottles or cans of 330 ml
Wine	73.5 glasses × 1.1 ≈ 81 glasses	17 bottles of 750 ml
Spirits	52.5 drinks × 1.1 ≈ 58 drinks × 40 ml	4 bottles of 700 ml
Mixers	58 drinks × 160 ml	About 9.5 L
Soft drinks for non-drinkers	15 × 6 × 250 ml × 1.1	About 25 L
Water for everyone	50 × 5 h × 0.25 L × 1.1	About 69 L
Ice	50 × 0.5 kg × 1.1	About 28 kg
Cups	2 per guest × 1.1	110

These numbers are estimates based on the rule of thumb. If your friends mostly drink beer, shift the split; if the party is a long dance night, you may want a slightly higher drinks-per-hour value.

Adjusting for your crowd and event

Situation	Adjustment
Dinner party, drinks with food	Fewer drinks per hour, more wine
Dance party or late night	Possibly slightly more per hour, more water and soft drinks
Daytime or garden party in summer	More water, soft drinks, beer and ice
Many guests driving	Fewer alcoholic drinks, more and better alcohol-free options
Guests bringing drinks	Plan less, but still cover water, mixers and ice
Cocktail party	Higher mixed-drink share and more mixers

Non-alcoholic drinks deserve real planning

Guests who do not drink alcohol should not be left with tap water. Good options:

• Alcohol-free beer and wine.
• A mocktail or two with fresh ingredients.
• Interesting sodas, iced tea, homemade lemonade.
• Sparkling water with fruit or herbs.

Put water in an obvious place and keep it topped up all night. It is the single most useful drink at any party.

Responsible hosting

Being a good host means looking after people, not just filling glasses.

• Legal drinking age: serve alcohol only to guests who are old enough under local law. If younger guests are present, keep alcohol under adult supervision.
• No pressure: never push anyone to drink, and avoid drinking games that encourage fast drinking.
• Food all night: serve food throughout the party, not only at the start.
• Water everywhere: make it free, visible and easy to reach.
• Pace the bar: close the bar or switch to soft drinks and coffee towards the end.
• Getting home safely: nobody drives after drinking. Have taxi numbers ready, know when the last public transport leaves, and offer a sofa if needed.
• Look out for each other: if someone has had too much, keep them company, give them water and help them get home safely. In an emergency, call the local emergency number.
• Know your responsibilities: rules about hosting and alcohol differ by country. Check the local rules if you are unsure.

Shopping and storage tips

• Buy from places that accept returns of unopened bottles, if available near you.
• Chill early. Bottles take hours to cool in a fridge; ice buckets or a bath of ice and water are faster.
• Ice disappears. Keep some in reserve in a cooler box.
• Set up a self-service bar with clear labels so people can find soft drinks just as easily as alcohol.

Common mistakes

• Forgetting non-drinkers. They need more than water.
• Too little ice. It melts quickly, especially outdoors.
• No mixers. Spirits are useless without tonic, cola or juice.
• No food late in the evening. Hungry guests and alcohol are a bad combination.
• No plan for getting home. Sort it before the first guest arrives.

Quick summary

1. Count drinking guests.
2. Multiply by 2 + (hours − 1).
3. Split by drink type and convert to bottles.
4. Add a 10% buffer.
5. Add soft drinks, water, mixers, ice and cups.

For the rest of the planning, from invitations to clean-up, use our house party planning checklist, and if you are working to a budget, see how to budget for a party.