You have finalised the guest list at 120, booked the venue, chosen the florist, and now you are staring at a spreadsheet trying to work out whether 300 bottles of prosecco is wildly optimistic or dangerously conservative. Estimating drinks per head is one of the most stressful parts of wedding planning, and getting it wrong means either watching Uncle Terry drain the bar by 8pm or returning a van-load of untouched Sauvignon Blanc the following Monday.
This guide breaks down the maths, the common mistakes, and the practical tricks that experienced hosts and wedding planners use to get it right - so you can relax and actually enjoy your own wedding.
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 two hours, then roughly one drink per person per hour after that. For a typical five-hour evening reception with 100 guests, that works out at around 600 to 700 drinks across the night.
But that number shifts dramatically depending on your crowd. A Friday evening summer wedding with a young guest list will drink more than a Sunday afternoon winter reception with a higher proportion of elderly relatives and children. Here is a rough breakdown to refine your estimate:
- Arrival drinks: 1.5 glasses per person during a 45-minute reception window
- Toast: 1 glass of sparkling per person (including those who barely sip it)
- Evening reception: 1 drink per person per hour for 4 to 5 hours
- Non-drinkers: Assume 10 to 15 per cent of your guest list will stick to soft drinks, and plan quality alcohol-free options for them rather than just tap water
A common trap is forgetting that not every drink is a full pour. Cocktails, for instance, count as a single drink but use multiple spirits - so 100 espresso martinis will chew through your vodka and coffee liqueur far faster than 100 glasses of wine.
Wine, Beer, Spirits - How to Split the Order
Once you have your total drinks figure, you need to decide what goes into the mix. For a wedding with a full bar offering, a sensible starting split looks like this:
- 40 per cent wine (skew towards white and rose in summer, add more red in winter)
- 30 per cent beer and cider
- 20 per cent cocktails or spirits with mixers
- 10 per cent soft drinks and mocktails
If you are running a cocktail-focused bar or a prosecco station, adjust accordingly. The key is knowing your guests. A crowd of craft beer enthusiasts will barely touch the Pinot Grigio, while a group that loves a gin and tonic will breeze through your botanical spirits in the first hour.
One bottle of wine pours roughly five glasses. A standard 70cl spirit bottle yields around 28 single measures. These numbers let you convert your per-head estimate into an actual shopping list - or, better yet, hand the estimate to your bar provider and let them handle the sourcing.
The Mistakes That Catch People Out
Even with solid maths, certain pitfalls trip up almost every couple planning their first wedding bar:
- Ignoring the weather: A heatwave sends consumption of chilled drinks soaring. Always have 20 per cent more cold beer, white wine, and soft drinks than you think you need for a summer wedding.
- Underestimating ice: You need far more than you expect - roughly 0.5 to 1 kg per person for a full evening. Running out of ice at 9pm is a guaranteed mood killer.
- Forgetting the evening guests: If 50 extra people arrive for the evening party, they will drink at the higher first-hour rate because they are catching up. Factor them into your per-head calculation separately.
- Over-ordering champagne for the toast: Half of those glasses end up abandoned. Consider offering the toast drink as an option alongside a soft alternative, rather than pouring 120 flutes that go flat on trays.
Why a Professional Bar Service Takes the Guesswork Away
The real secret most seasoned wedding planners will tell you is that estimating drinks is only half the problem. Chilling, storing, serving, and managing stock on the day is where things actually go wrong. A staffed mobile bar service handles all of this - your bar team arrives with chilled stock, professional-grade ice, glassware, and the experience to pace service so that the drinks flow steadily rather than flooding out in the first hour and trickling by the last dance.
A good bar provider will also consult with you on your guest list demographics, your venue layout, and your chosen drinks menu to fine-tune the estimate before a single bottle is ordered. That means less waste, less stress, and no emergency dash to Tesco at half seven.
What If You Want to Supply Your Own Drinks?
Some couples prefer to buy their own stock, especially if they have a wholesale connection or want to feature wines from a honeymoon vineyard. In that case, a self-serve option like a Bar in a Box setup gives you a professionally presented bar counter, glassware, and all the kit - while you control exactly what goes behind the bar. It works brilliantly when paired with the per-head estimates above, because you are buying with precision rather than guessing.
Whether you want a fully staffed cocktail bar where the drinks calculation is handled entirely for you, or a self-serve setup where you supply the stock and just need the hardware, Viva Bar Hire can tailor either option to your wedding size, venue, and budget. Get in touch through vivabarhire.co.uk for a free consultation - the team will help you nail the numbers so the only thing you need to count on the day is your blessings.