Start with guest count and hours
The two inputs that matter most are guest count and how long wine is actually being poured. A four-hour dinner with beer and cocktails available behaves very differently from an all-day wedding where wine is the default drink for most guests.
Then split the crowd realistically
Do not assume every guest drinks wine at the same rate. A useful planning split is:
- non-drinkers or light drinkers
- moderate drinkers
- heavier wine drinkers
If cocktails, beer, and sparkling wine are all on offer, table wine usually carries less of the total load than couples expect.
Practical rule
It is cheaper to model a small safety buffer than to solve a shortage mid-service with emergency restaurant pricing or last-minute supermarket substitutions.
Choose a red, white, and sparkling split
The mix should reflect season, menu, and venue temperature. Summer afternoon events generally skew whiter and lighter. Cool-weather evening receptions can support a more even split or a slight red lean.
Budget in cases, not bottles
Once you have an estimated bottle count, convert it into full cases, then round up sensibly. That helps you compare merchant offers and spot whether a marginal quality upgrade is affordable before you lock in the order.
Need a faster answer for a common case?
If your wedding is close to 100 guests, start with the more targeted guide: How much wine for 100 guests in the UK. It gives a tighter planning range before you fine-tune the numbers in the calculator.