Quick Answer
For 20 people, you need 40 racks. This provides about 80 servings, assuming 4 servings per person.
Estimated cost: $600 - $1200
How We Calculate
We use the industry-standard formula for rib calculations:
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Each person eats approximately 4 racks
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Formula: 20 people × 4 servings ÷ 2 = 40 racks
Adjusting for Your Event
Use our interactive calculator above to fine-tune your order:
- Light appetite: Reduce by 25% if guests had a recent meal or there are
many other food options
- Normal appetite: Standard calculation for typical party situations
- Hungry guests: Increase by 25% for active groups, late-night events,
or when ribs are the main attraction
Tips for Ordering Ribs
- Baby back ribs are more tender, spare ribs are meatier
- Plan 4-6 ribs per person as a main dish
- Can be pre-cooked and finished on the grill
- Rest ribs 10 minutes before cutting for juicier meat
- Provide plenty of napkins and wet wipes
Planning Guide: Ribs for Your Event
The baby back versus spare ribs decision impacts both your budget and guest satisfaction. Baby back ribs are shorter, leaner, and more tender because they come from higher on the pig near the loin. They cook faster (4-5 hours) and are perceived as premium, commanding prices 30-50% higher than spare ribs. Spare ribs come from the belly area, are meatier and fattier, and require longer cooking (5-6 hours) but deliver deeper flavor. For parties, spare ribs offer better value and hold up better in warming situations because their higher fat content prevents them from drying out. A compromise option is St. Louis-style ribs - spare ribs with the brisket bone removed for more uniform cooking. Most guests can't actually tell the difference once ribs are properly smoked and sauced, so unless you're hosting BBQ enthusiasts, choose based on budget and cook time rather than prestige.
Competition-style rib preparation involves the 3-2-1 method that transforms tough ribs into tender, fall-off-the-bone perfection. Smoke unwrapped for 3 hours, wrap in foil with liquid (apple juice, beer, or butter) for 2 hours, then unwrap and sauce for the final hour. This technique works brilliantly for parties because the wrapped phase can be done in advance - smoke and wrap ribs the day before, refrigerate, then finish with the final hour of cooking and glazing on party day. This splits the work and reduces stress. However, purists argue that fall-off-the-bone ribs are overcooked - proper ribs should have slight resistance and pull cleanly from the bone without the meat sliding off. Know your audience: backyard parties expect fall-off-the-bone, while BBQ competitions penalize it.
Rib cutting and serving strategy prevents the chaos of guests struggling with full racks. Always separate ribs into individual bones before serving - use a sharp knife between bones rather than sawing through them. For appetizer-style service, cut racks into 2-rib sections so guests can grab a portion without committing to a full rack. Arrange cut ribs on large platters or in aluminum half-pans, slightly overlapping for visual appeal. Keep ribs warm in a 200°F oven tented with foil, but don't wrap tightly or they'll steam and lose their bark. Set up a 'rib station' with plenty of wet wipes, paper towels, and multiple trash cans - rib bones create substantial waste. For outdoor events, provide small paper bags or plates for guests to collect their bones rather than creating a pile. One full rack typically creates enough bones to fill a dinner plate, and improper waste management leads to unsightly messes that detract from the party atmosphere.