The Question Every Host Agonises Over
You have confirmed the guest list, booked the venue, and chosen the menu. Now you are staring at a spreadsheet trying to work out whether 150 guests will drink 300 glasses of prosecco or 600. Order too little and you face the nightmare of a dry bar at nine o'clock. Order too much and you are left with crates of warm lager nobody wanted. Getting drinks quantities right is one of the most stressful practical puzzles in event planning, and it is the question our team at Viva Bar Hire gets asked more than any other.
After staffing thousands of events across the UK, from intimate garden parties to 500-guest weddings and black-tie corporate dinners, we have built up a reliable set of benchmarks. This post shares the formulas we actually use so you can plan with confidence rather than guesswork.
The Golden Rule: Drinks Per Person Per Hour
The drinks industry standard is straightforward but often misquoted. Here is what the data consistently shows across UK events:
- First hour: approximately 2 drinks per person
- Every subsequent hour: approximately 1 to 1.5 drinks per person
- Arrival reception drinks: 1.5 glasses per person for a 30 to 45 minute reception
So for a five-hour evening event with 100 guests, you are looking at roughly 550 to 650 individual servings. That sounds like a lot, but remember a serving is a single measure, a 175ml glass of wine, or a half pint of beer. The figure also assumes a mix of drinkers and non-drinkers, which brings us to the next consideration.
Adjusting for Your Specific Crowd
No two guest lists drink the same way. A Friday evening corporate Christmas party with an open bar will consume significantly more than a Sunday afternoon christening. Here are the key variables to factor in:
- Time of day: Afternoon events typically see 20 to 30 per cent lower consumption than evening events.
- Day of the week: Saturday nights run higher than midweek gatherings. Sunday events tend to be lighter.
- Open bar vs cash bar vs limited tab: An open bar increases consumption by roughly 20 per cent compared with a pay bar. A capped tab sits somewhere in between.
- Age profile: A 30th birthday crowd will generally drink more per head than a 70th birthday celebration. Adjust by 10 to 15 per cent either way.
- Season and weather: Summer garden parties see higher demand for lighter drinks like Pimms, gin and tonic, and prosecco. Winter events lean towards red wine, whisky, and cocktails, but overall volume can be slightly lower.
- Food service: A sit-down meal with wine poured at the table changes the ratio. Canape receptions without a structured meal often see faster consumption.
If you are unsure, round up slightly. Running out is always worse than having a modest surplus, especially when many suppliers accept returns on unopened stock.
Translating Servings into Bottles and Kegs
Once you have your total serving estimate, converting to actual quantities is simple arithmetic but easy to get wrong. Here are the numbers you need:
- Wine: A standard 750ml bottle gives approximately 5 glasses at 150ml or 4 generous glasses at 175ml.
- Prosecco and champagne: 6 flute servings per bottle.
- Spirits: A 70cl bottle yields 28 single measures at 25ml.
- Beer kegs: A standard 50-litre keg provides roughly 88 pints.
- Bottled beer and cider: Budget one bottle per serving.
- Cocktails: Depends on the recipe, but most standard cocktails use 50ml of base spirit, giving around 14 cocktails per 70cl bottle before accounting for mixers and liqueurs.
A useful starting split for a mixed UK crowd is roughly 40 per cent wine and prosecco, 30 per cent beer and cider, 20 per cent spirits and cocktails, and 10 per cent soft drinks and mocktails. For weddings, prosecco and wine tend to dominate, pushing that category closer to 50 per cent.
What About Non-Drinkers and Soft Drinks?
This is the category most hosts underestimate. Current trends show that between 15 and 25 per cent of UK adults are choosing not to drink alcohol at any given event, and that number is rising. Always budget for a generous soft drinks offering including sparkling water, premium mixers, elderflower presse, and at least one or two alcohol-free cocktail options. Non-drinkers deserve more than a sad jug of orange squash, and a thoughtful selection reflects well on any host.
Let Viva Bar Hire Take the Guesswork Away
The truth is, you do not need to do all of this alone. When you book a staffed bar with Viva Bar Hire, our team handles the quantity planning for you. We ask the right questions about your event, your guests, and your preferences, then we build a drinks list and stock estimate tailored to your specific occasion. If you prefer the hands-on approach, our Bar in a Box self-serve package comes with detailed guidance on quantities based on your guest count.
We operate UK-wide and have stocked bars for every type of event imaginable, from elegant Cotswolds weddings to rooftop cocktail parties in Manchester and festival bars in muddy fields in Devon. Whatever the occasion, we would love to help you get the numbers right and the drinks flowing.
Get in touch with the team at vivabarhire.co.uk for a free, no-obligation quote and let us worry about the maths while you enjoy being a guest at your own party.