How Many Drinks for Your Party? Free Calculator (2026)

For 15 guests at a 2-hour party, plan about 30 cans of soda (12 oz) — that is 2 drinks per hour per guest as the blended baseline, with a 50/30/20 split across soda, water, and juice. Mix 2-3 flavors (cola, lemon-lime, plus one fun pick). If guests will pour into cups, 5 two-liter bottles replace the cans at roughly 40-50% lower cost.

For 20 guests at a 2-hour party plan about 7 two-liter bottles of soda — that covers roughly 40 servings (about 50% of total drinks). Each 2-liter bottle pours ~6 cups. According to Party Genius AI's drink data, kid-heavy parties lean soda-heavy while adult parties lean water-heavy; either way, a 50/30/20 soda/water/juice mix is the safe default.

For a 1-hour party, yes. For a 2-3 hour party, no — plan 2 drinks per hour per guest as the baseline. A 20-guest, 2-hour party needs 80 drinks total, not 40. For longer summer or outdoor parties, add 50% for summer or 25% for outdoor. Running out of drinks is the most common party complaint, and the marginal cost of one more case is rarely worth the risk.

For an outdoor party, plan 30% of total drinks as water plus a 25% outdoor bump on top of the baseline. A 30-guest, 3-hour outdoor party in mild weather needs about 68 water bottles. If it is also summer, bump to 90 bottles. Always over-order water by 20% — it is cheap, every guest drinks it, and it doubles as a sober-driver option for adult parties.

For a kids' party, plan about 20% of total drinks as juice — roughly 2 juice boxes per child for a 2-hour party. Juice boxes (4-6 oz) are sized for one sitting, so you don't need to budget by the hour like with soda or water. For 15 kids over 2 hours, buy 30 juice boxes — a single 32-pack from a warehouse club covers it for about $9.

Multiply your guest count by 6 (that is 2 drinks/hour × 3 hours) to get total drinks, then split 50/30/20 across soda, water, and juice. A 20-guest 3-hour party needs 120 drinks: 60 sodas, 36 water bottles, and 24 juice boxes. Add 25% if outdoor, plus another 50% on top if it is summer — for a hot outdoor 3-hour party, that 20-guest count climbs to 210 drinks.