Quick answer: Allow two 150 ml (5 fl oz) mugs of mulled wine per person for the first hour and one per hour after. A standard 750 ml bottle of wine makes about five mugs once the added juice and spirit are counted, so 20 guests over three hours need roughly 8 bottles, or 6 litres of finished mulled wine.
One bottle of red makes about six mugs of mulled wine. For ten guests having it as a welcome drink, buy three bottles. That's the number, and the rest of this page is why it isn't the number most recipes give you.
Here's the problem. Ask three good recipes how many servings a bottle makes and you get 5, 5, and 7.5. They're all correct. They just aren't answering the same question, and none of them tells you the thing that makes the difference.
Why the sources disagree — and it's not what you'd guess
The spread has nothing to do with the recipes and everything to do with the size of the glass.
| Recipe | Wine | Added liquid | Total batch | Stated servings | Actual ml per serving |
|---|---|---|---|---|---|
| Cookie and Kate | 750 ml | ¼ cup brandy + juice of 1 large orange | ~890 ml | 5 | ~175 ml |
| Spice Cravings (Glühwein) | 750 ml | ¾ cup water, ½ cup OJ, 1.5 oz brandy | ~1,090 ml | 5 | ~218 ml |
| Rosanna ETC (for a crowd) | 4 × 750 ml | 850 ml water | 3,850 ml | 30 | ~128 ml |
Rosanna's four bottles making thirty glasses works out at 7.5 glasses a bottle. Cookie and Kate's bottle makes five. That looks like a 50% disagreement about mulled wine. It isn't. It's a disagreement about whether a "glass" is 128 ml or 218 ml, and once you normalise for that, all three land in the same place.
So "servings per bottle" is a meaningless figure unless someone tells you the pour size. Almost nobody does.
One aside worth flagging: the Spice Cravings recipe states five servings but also notes "I usually account for 2 cups per person." Two cups is roughly 470 ml, which would make the same batch serve two people, not five. I've used the stated yield in the table above, but the internal contradiction is real and I'd rather point at it than quietly pick one.
The planning number
I'm going to plan against a 150 ml mug, because that's a normal pour into a normal heatproof glass and it sits sensibly between the extremes above. If you're using big Christmas-market-style mugs, scale up.
A typical mulled wine dilutes the wine by roughly 15% to 45% — a splash of juice, some water, a slug of brandy. Take the middle of that:
- 750 ml wine, diluted to about 960 ml
- ÷ 150 ml per mug
- = 6.4 mugs per bottle, call it 6
Six is deliberately the round-down. Running out is worse than the alternative.
How many bottles for how many guests
The other half of the calculation is consumption, and this is where a general drinks calculator will steer you wrong. Mulled wine is hot. Hot drinks get sipped, not knocked back, and a mug that needs to cool before the first mouthful paces itself. The standard party rule — two drinks in the first hour, one per hour after — over-buys badly for mulled wine.
Two honest scenarios:
As a welcome drink (people arrive, warm up, then move to wine or beer). Plan 1.5 mugs per person.
As the main drink all evening (a three-hour winter gathering where mulled wine is the point). Plan 3 mugs per person.
| Guests | Welcome drink | Main drink, ~3 hours |
|---|---|---|
| 10 | 15 mugs → 3 bottles | 30 mugs → 5 bottles |
| 20 | 30 mugs → 5 bottles | 60 mugs → 10 bottles |
| 30 | 45 mugs → 8 bottles | 90 mugs → 15 bottles |
| 50 | 75 mugs → 13 bottles | 150 mugs → 25 bottles |
Treat the right-hand column with suspicion at the bottom end. Almost nobody drinks mulled wine exclusively for three hours, and twenty-five bottles is a lot of simmering. For a big party, use the welcome-drink column for mulled wine and work out the rest with the party drink calculator.
The pot problem
This is the constraint nobody writes about, and it's the one that actually ruins evenings.
A 5-litre stockpot or a large slow cooker holds about 5 litres of finished mulled wine, which at 150 ml a mug is roughly 33 mugs — a little over five bottles' worth once diluted. So one pot serves about 20 people a welcome drink, or 11 people across an evening.
Above that you're reheating in batches, and reheating takes 20 to 30 minutes from cold. Plan a second pot rather than a second batch. Guests do not queue politely for round two.
How strong is it, really?
Weaker than the wine, but not by as much as people assume — and this is genuinely contested territory, so here's what's actually known.
Two things reduce the strength. The first is dilution, and it's simple arithmetic: a 13% wine diluted to 960 ml comes out around 10% ABV before any heating.
The second is evaporation, and here the honest answer is that the commonly cited figures don't quite fit. The USDA Table of Nutrient Retention Factors is the standard reference: it gives 85% alcohol retained when alcohol is stirred into a hot liquid, 40% after 15 minutes of simmering, 35% after 30 minutes, and 25% after an hour. But those factors were measured on cooked dishes — stirred, often uncovered — not on a lidded pot of wine held below a simmer. Applying them directly to mulled wine is an extrapolation, not a measurement.
Wine Spectator's Dr. Vinny makes the same point from the other direction: the amount that "cooks out" is "typically less than people tend to think," and it depends on the starting alcohol, the time, the temperature and whether the pan is open and shallow.
The practical upshot: keep the pot below 78°C (172°F), which is the boiling point of ethanol, and you lose far less than the cooking charts suggest. Never let it boil. Beyond preserving the alcohol it also stops the spices going bitter, which both recipes above warn about independently.
So a 150 ml mug is plausibly somewhere between 4% and 10% ABV depending on how long it's been sitting. Using the NHS definition of a unit — 10 ml of pure alcohol, calculated as ABV × volume ÷ 1,000 — a 150 ml mug at 10% contains 15 ml of pure alcohol, or 1.5 UK units. That's the same as a small 125 ml glass of 12% wine.
Which is the point worth making to guests: it tastes like a hot spiced drink, and it is a full glass of wine. Readers in the US and Australia should convert against their own standard-drink measure — the ml-of-pure-alcohol figure above is the unambiguous one to work from.
The short version
Six mugs a bottle. Three bottles for ten guests as a welcome drink. One big pot serves about twenty. Keep it under 78°C and never boil it. Treat each mug as a full glass of wine, because it is.
If mulled wine is only part of the evening, the Christmas party drink quantities guide covers the whole table, and the prosecco guide handles the fizz end of it.
Next step: if you're buying still wine for the same party, the wine calculator does the bottles-per-guest maths properly — and it's worth doing separately, because as this page shows, mulled wine and still wine are genuinely different sums.