TL;DR: One to one and a half bottles per guest for a two to three hour party. Thirty guests: 30 to 45 bottles, which is three or four 10-packs at $39 each. Order by Wednesday for Friday delivery. Done.
The whole calculation
| Guests | Bottles | Packs | Cost |
|---|---|---|---|
| 10 | 10–15 | 1–2 | $39–$78 |
| 20 | 20–30 | 2–3 | $78–$117 |
| 30 | 30–45 | 3–4 | $117–$156 |
| 50 | 50–75 | 5–7 | $195–$273 |
| 100 | 100–150 | 10–15 | $390–$585 |
The rule is one to one and a half bottles per guest. Round up if your friends are the kind who talk about coffee. Round down if the party is mostly children and aunties who brought their own tea.
Why bottles beat a coffee cart at this size
A barista cart is a person, equipment, and an hourly rate. For thirty guests you would be paying someone to stand next to a machine for three hours. Bottles arrive cold, sit in a tub of ice, and serve themselves. Nobody queues.
Questions people actually ask
How many bottles of coffee per person at a party?
Plan one to one and a half 300ml bottles per guest for a two to three hour event. Coffee drinkers have one, enthusiasts have two, some guests have none. It averages out.
How many bottles for 50 guests?
Fifty to seventy-five bottles. Five to seven 10-packs. If your crowd skews heavy on coffee, seven.
What happens to leftover bottles?
They keep 3 to 5 days in the fridge. Leftovers are next week’s coffee, not waste.
Buy the 10-pack — or see the full party page.