From guest count to a drink shopping list
Start with RSVPs, the actual service window and your beverage menu. Total guests carries across the tent calculator and tablecloth tool, but adults and adult drinkers are separate inputs. Confirm these counts before using the list. Children are never added to alcohol demand.
The purchasing formula
Alcohol base servings = adult drinking guests × service hours × stock servings per adult drinker per hour. Buffered servings = base × (1 + buffer percentage / 100). Each beverage category receives its selected percentage of that stock and rounds up to a complete serving.
Complete servings per bottle = floor(bottle capacity in mL / serving size in mL). Minimum bottles = ceil(category servings / complete servings per bottle). Whole cases = ceil(minimum bottles / bottles per case). Bottles and whole cases are alternative purchase plans; do not add both. Fractional leftover pours are not pooled across bottles.
Nonalcoholic base servings = hours × (non-drinking guests × their soft-drink rate + adult drinking guests × their soft-drink rate). The same stock buffer applies once. This combines water and soft drinks into one editable volume line; divide it by your actual menu. For single-serve bottles or cans, set serving size equal to container capacity. It is not a hydration recommendation.
A calculated example for 150 total guests
The editable example uses 120 adults of legal drinking age and 20% non-drinking adults: floor(120 × 0.8) = 96 adult drinkers. Over 4 hours at 0.75 stock servings per hour, the base is 288 servings. Adding 10% gives 316.8 before category rounding. The beer / wine / spirits mix is 40% / 40% / 20%. These rates, counts, mix, buffer, bottle sizes and case sizes are example purchasing assumptions, not industry standards.
| Beverage | Rounded servings | Complete servings / bottle | Minimum bottles | Whole cases instead |
|---|---|---|---|---|
| Beer | 127 | 1 | 127 | 6 × 24 = 144 bottles |
| Wine | 127 | 5 | 26 | 3 × 12 = 36 bottles |
| Spirits | 64 | 16 | 4 | 1 × 6 = 6 bottles |
| Water / soft drinks | 449 | 2 | 225 | 10 × 24 = 240 bottles |
Serving references and adjustable assumptions
The NIAAA standard-drink reference describes 12 US fl oz of 5% beer, 5 US fl oz of 12% wine and 1.5 US fl oz of 40% spirits. Those volumes supply this tool’s initial pour-size examples only. Stronger products or larger pours can contain more alcohol. NIAAA does not validate this tool’s stock rates, beverage split or buffer.
One US fl oz is converted as 29.5735295625 mL. A 750 mL wine bottle at a 5 fl oz pour therefore supplies five complete servings; a 750 mL spirits bottle at 1.5 fl oz supplies sixteen. Read your actual labels and recipes. The initial 355 mL beer container and 500 mL nonalcoholic bottle are editable packaging examples, as are the case counts.
Before placing the order
- Confirm the adult RSVP count, non-drinking preferences, service hours and whether staff or vendors need separate soft drinks.
- Use your licensed caterer or bartender’s menu and measured pours. Add mixers, ice, garnishes and any separate toast deliberately; they are not automatically included.
- Ask the venue and provider about age checks, service permissions, storage, cooling, access and cleanup. This calculator does not establish legal compliance or safe consumption.
- Use event tent layout to reserve bar and service space, then enter measured tables in the linen calculator. Shopping volume alone does not determine bar area or staffing.
Wedding drink calculator FAQ
How many drinks should I buy for a wedding?
Use expected adult drinkers × service hours × your chosen stock servings per hour, then add the chosen buffer. Split that stock by beer, wine and spirits, round each category to complete servings, then to whole bottles or cases. Rates and percentages are purchasing assumptions, not individual consumption advice.
Does the tent guest count mean everyone drinks alcohol?
No. Total guests includes children and non-drinkers. Enter adults of legal drinking age separately, then use either a known adult drinking count or an estimated non-drinking share of adults. The adult count is never inferred from the tent seating count.
How many 5-ounce pours fit in a 750 mL wine bottle?
A US fluid ounce is 29.5735295625 mL, so a 5 fl oz pour is about 147.87 mL. A 750 mL bottle holds five complete pours. This calculator discards the remainder for planning and rounds required bottles up. Changing the bottle or pour size changes that result.
Are bottles and cases two separate things to purchase?
No. They are alternative shopping quantities. Buy the minimum individual bottles or the shown number of complete cases. Whole cases can contain more stock than the minimum bottle count; that difference is displayed.
Does the list include water and nonalcoholic drinks?
Yes. Non-drinkers and adult alcohol drinkers each have a separate editable nonalcoholic serving rate. Their combined servings are multiplied by service hours and the buffer, then converted to your chosen bottle and case sizes. Split this combined line into water, soda and other drinks according to your menu.
Is the hourly rate a safe amount to drink?
No. It is an adjustable stock-planning assumption. This tool does not estimate blood alcohol, safe consumption, driving ability or individual limits. Serving sizes do not establish alcohol strength. Work with a licensed service provider on age checks, service and your venue rules.