How Many Ribs Per Person?
Published October 2026 · Numbers use the same portions and prices as our calculators. How we calculate
Plan half a rack of baby back ribs per adult when ribs are the main dish, which is about 1 lb of bone-in ribs per person. Meatier St. Louis-cut or whole spare rib racks go further, so you buy fewer racks for the same crowd. "Rack" and "slab" mean the same thing.
For cooker space, charcoal and a full shopping list, use the ribs guides by party size.
Rack Weight and People Per Rack
| Cut | Rack weight | Bones | People per rack | Per adult (main dish) |
|---|---|---|---|---|
| Baby back (loin back) | ~2 lbs | 11–13 | 2 | ½ rack (about 6 bones) |
| St. Louis-cut spare ribs | ~2.75 lbs | 11–13 | 2–3 | about ⅓–½ rack |
| Whole spare ribs | ~3.5 lbs | 13 plus tips | 3 | about ⅓ rack |
Racks of Ribs for 10–100 Guests
Main dish, about 1 lb bone-in per adult. The last column is how many baby back racks you need if ribs are one of two meats (about 60%).
| Guests | Baby back racks | St. Louis racks | Whole spare racks | Total weight | Baby backs, with another meat |
|---|---|---|---|---|---|
| 10 | 5 | 4 | 3 | 10 lbs (4.5 kg) | 3 |
| 15 | 8 | 6 | 5 | 15 lbs (6.8 kg) | 5 |
| 20 | 10 | 8 | 6 | 20 lbs (9.1 kg) | 6 |
| 25 | 13 | 10 | 8 | 25 lbs (11 kg) | 8 |
| 30 | 15 | 11 | 9 | 30 lbs (14 kg) | 9 |
| 40 | 20 | 15 | 12 | 40 lbs (18 kg) | 12 |
| 50 | 25 | 19 | 15 | 50 lbs (23 kg) | 15 |
| 75 | 38 | 28 | 22 | 75 lbs (34 kg) | 23 |
| 100 | 50 | 37 | 29 | 100 lbs (45 kg) | 30 |
Smoking Time by Cut
| Cut | At 225–250°F | Done when |
|---|---|---|
| Baby back ribs | about 5–6 hours | the rack bends and cracks on the surface; about 195–205°F between the bones |
| St. Louis or spare ribs | about 6–7 hours | same bend test; meat pulls back from the bone ends |
Pork ribs are safe from 145°F with a 3-minute rest (USDA), but they only turn tender in the 195–205°F range, which is why low-and-slow takes hours. Cook time depends on the cut, not on how many racks are in the smoker.
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FAQ
How many racks of ribs per person?
Plan half a rack of baby back ribs per adult when ribs are the main dish, about 1 lb of bone-in ribs. A meatier St. Louis or spare rib rack feeds 2–3 people.
How many pounds of ribs per person?
About 1 lb of raw, bone-in ribs per person. Roughly half of that weight is bone, so each guest gets about half a pound of meat.
How many bones of ribs per person?
About 6 baby back bones (half a rack) per adult as a main dish, or 3–4 bones when ribs are one of several meats.
How long do ribs take to smoke?
At 225–250°F, baby backs take about 5–6 hours and St. Louis or spare ribs about 6–7 hours. They are done when a rack bends and the surface cracks.