You have finalised the guest list at 120, the caterer is booked, and the venue looks stunning - but now you are staring at a spreadsheet trying to work out whether 200 bottles of prosecco is wildly too many or nowhere near enough. Getting drinks quantities right for a wedding reception is one of those deceptively tricky logistics tasks that can make or break your budget, and it causes more last-minute panic than almost any other detail on the planning checklist.
The Golden Rule: Units Per Person Per Hour
The drinks industry works on a simple baseline that has proved remarkably reliable across thousands of UK events. For a standard wedding reception lasting around five hours of drinking time (arrival drinks through to the last dance), plan for roughly one drink per person per hour. That gives you five drinks per guest across the entire event.
In practice, however, the first hour is usually the thirstiest. Guests arrive, they are excited, they accept that welcome drink immediately and often have a second before they sit down. After the meal, consumption typically slows. A more accurate model looks like this:
- Arrival and canapes: 1.5 to 2 drinks per person in the first hour
- During the meal: roughly 1 drink per person per hour (often wine poured at the table)
- Evening reception: 1 drink per person per hour, tapering after 10pm
- Toast: one glass of fizz per person
For 120 guests over five hours, that puts you somewhere around 600 total serves. Not 600 bottles - 600 individual glasses, which is a very different number once you start converting into bottles.
Converting Serves into Bottles and Cases
This is where most couples trip up. A standard 75cl bottle of wine or prosecco gives you six glasses. A 70cl bottle of spirits yields roughly 28 single measures (25ml each). A keg of lager typically pours around 88 pints. Once you map your expected drink split onto those numbers, the quantities start to look far more manageable.
Suppose your 120-guest wedding has a crowd that is roughly 50 percent wine drinkers, 25 percent beer drinkers, and 25 percent cocktail or spirit drinkers, with everyone having a glass of fizz for the toast. A reasonable shopping list might look like:
- Prosecco for arrival and toast: around 35 to 40 bottles (two glasses each for arrival, one for the toast)
- Wine for the meal: roughly 30 bottles of white and 15 of red (adjust for seasonal preference)
- Beer and lager: two to three kegs or 8 to 10 cases of bottled beer
- Spirits and mixers: four to five bottles across your key choices (gin, vodka, rum, whisky) plus plenty of tonic and soft mixers
- Soft drinks: always more than you think - budget for at least 15 to 20 percent of guests being non-drinkers or light drinkers
These are guidelines, not gospel. A summer wedding with a late-afternoon start will lean heavier on cold beer and rose. A winter evening affair in a Cotswolds barn will see more red wine and warming cocktails disappear.
Know Your Crowd (Seriously)
Generic calculators cannot account for the fact that your university friends drink very differently from your grandparents. Think honestly about your guest demographics. A younger crowd at a festival-style celebration will get through more beer and cocktails. A more formal gathering with an older demographic may favour wine and champagne. If you are hosting a significant number of families with children, your soft drink provision needs to go up and your alcohol estimate can come down.
Time of year matters too. Summer guests drink more - not necessarily more alcohol, but more liquid in general. Stock extra water, elderflower presse, and non-alcoholic options for warm-weather receptions.
The Safety Net: How a Professional Bar Service Removes the Guesswork
One of the biggest advantages of hiring a professional mobile bar team is that estimating quantities becomes their problem, not yours. Experienced bar operators have run hundreds of weddings and they know, almost instinctively, how a particular crowd will drink based on guest count, season, venue style, and running order. They will build a tailored drinks plan, handle the ordering, manage stock on the night, and - crucially - adjust in real time if guests are drinking faster or slower than expected.
This is especially valuable if you are choosing a cocktail-focused bar, where ingredient ratios and batch preparation add another layer of complexity that a drinks calculator simply cannot handle.
What About Leftover Stock?
Over-ordering stings, but running dry mid-reception is worse. Many professional bar hire companies operate on a sale-or-return basis for unopened bottles, which takes the financial risk out of rounding up. If you are managing your own supply - perhaps using a self-serve setup - buy from a retailer with a clear returns policy and keep receipts. Boxed wine and kegs, once opened, cannot be returned, so err slightly conservative on those and keep a reserve of bottled options that can be opened only if needed.
If you would rather hand the whole thing over to someone who does this every weekend, Viva Bar Hire can help. From fully staffed wedding bars with bespoke cocktail menus to the self-serve Bar in a Box for couples who want a more relaxed DIY setup, the team will guide you through quantities, stock planning, and service style so you can focus on enjoying the day. Get in touch at vivabarhire.co.uk for a free quote tailored to your guest count and vision.