You have confirmed the guest list, booked the venue, and chosen a stunning bar setup - but now you are staring at a spreadsheet trying to work out how many bottles of prosecco, cases of beer, and litres of gin you actually need. Over-order and you are left with crates of warm lager nobody wants. Under-order and your guests are sipping tap water by 9pm. Getting drinks quantities right is one of the most stressful parts of event planning, and it is the question our team at Viva Bar Hire answers more than any other.
The Golden Rule: Drinks Per Person Per Hour
The drinks industry works on a simple baseline: one to two drinks per person per hour for the first couple of hours, then roughly one drink per person per hour after that. But that figure shifts dramatically depending on the type of event, the time of day, and who is attending.
A Saturday evening wedding reception with a free bar will see much higher consumption than a Sunday afternoon christening. A corporate summer party where guests are networking tends to be lighter than a 40th birthday where everyone has booked taxis home and has no intention of holding back. Context is everything.
Here is a rough breakdown for common event lengths:
- 3-hour event (e.g. drinks reception or corporate networking): approximately 4 drinks per person
- 5-hour event (e.g. evening wedding reception): approximately 6 to 7 drinks per person
- 8-hour event (e.g. full wedding day or festival): approximately 8 to 10 drinks per person
These are averages. Some guests will have two drinks all night. Others will single-handedly keep your gin supply under pressure. The averages account for both.
Splitting the Order: What Ratio of Beer, Wine, and Spirits?
Knowing the total number of drinks is only half the puzzle. You also need to know what to buy. A common mistake is ordering based on your own preferences rather than thinking about the full guest list.
For a general mixed-age crowd at a celebration, a sensible starting split looks like this:
- 40% beer and cider - lager, ale, and a cider option cover most casual drinkers
- 30% wine and prosecco - essential for toasts, meals, and guests who prefer a glass of something lighter
- 20% spirits and cocktails - gin and tonic remains the most requested, followed by vodka-based cocktails and espresso martinis
- 10% soft drinks and non-alcoholic options - never underestimate this category; non-alcoholic beers, mocktails, and quality soft drinks are no longer an afterthought
If you are hosting a younger crowd at a birthday or hen do, shift the balance towards cocktails and prosecco. For a relaxed garden party with an older demographic, increase the wine and real ale allocation. For a corporate event, always increase the soft drinks percentage - plenty of attendees will be driving or simply prefer not to drink at work functions.
The Variables That Catch People Out
Several factors reliably cause hosts to misjudge quantities:
- Weather: A hot July day at a marquee wedding will increase consumption by 15 to 20 percent. Guests drink faster and favour lighter, chilled options like prosecco, gin and tonic, and cold beer.
- Free bar vs. pay bar: If you are offering a completely free bar, expect consumption to be higher than the averages above. A pay bar or token system naturally self-regulates.
- Arrival drinks: The first hour always sees the heaviest consumption. If you are serving welcome cocktails or a prosecco reception, factor in at least 1.5 glasses per person just for that window.
- Food timing: If there is a long gap between the ceremony and the meal, guests drink more while waiting. A well-timed canape service can slow consumption noticeably.
- Late-night bar: After 10pm, consumption typically drops. Many guests switch to simpler orders - beer, gin and tonic, or a final glass of wine.
What Happens If You Get It Wrong?
Over-ordering is a common fear, but it is usually the lesser evil. Unopened bottles and sealed stock can often be returned if you are working with a supplier who offers a sale-or-return arrangement. Running out, on the other hand, leaves a lasting impression - and not a good one.
This is one of the biggest advantages of working with a professional mobile bar service rather than trying to manage stock yourself. When Viva Bar Hire manages the bar for your event, our team handles the drinks estimate based on your guest count, event type, duration, and preferences. We have stocked bars for intimate 30-person suppers and 500-guest festivals, and that experience means we know exactly where the tipping points are.
If you prefer a more hands-on approach, our Bar in a Box self-serve package gives you a beautiful bar setup that you stock and manage yourself - and we are always happy to advise on quantities before you place your order with a supplier.
A Quick Cheat Sheet to Save and Share
For a 100-guest evening wedding reception lasting five hours with a free bar, a solid starting order looks roughly like this:
- 120 bottles of beer and cider
- 25 bottles of wine (a mix of red, white, and rose)
- 15 bottles of prosecco or champagne
- 4 bottles of gin, 2 bottles of vodka, plus tonics and mixers
- A selection of non-alcoholic alternatives - at least 40 servings
Adjust up or down based on the variables above, and always round up slightly. It is far better to have a few bottles left over than to watch the bar run dry during the best man's speech.
If you would rather leave the maths to someone who does this every weekend, Viva Bar Hire can take the guesswork out entirely. Whether you want a fully staffed cocktail bar, a rustic mobile pub, or a self-serve Bar in a Box, our team will make sure every glass stays full from the first toast to the last dance. Get in touch at vivabarhire.co.uk for a free, no-obligation quote tailored to your event.