Quick answer: plan on 6 oz of cooked pulled pork per adult for sandwiches (8 oz for a plated serving). A pork butt loses about 45% of its weight while cooking, so buy roughly 1 lb of raw pork butt per person when pulled pork is served plated as the only main, or about ⅔ lb raw per person for sandwiches.
You serve cooked weight but you buy raw weight, and a pork butt shrinks hard: fat renders out and moisture evaporates until only about 55% of the raw weight is left as pullable meat. So the math for any crowd is: guests × cooked ounces ÷ 16 ÷ 0.55 = raw pounds to buy.
| Guests | Cooked pork needed | Raw to buy (only main, sandwiches) | Raw to buy (with a 2nd main) |
|---|---|---|---|
| 10 | 3¾ lb | 7 lb | 5 lb |
| 20 | 7½ lb | 14 lb | 10 lb |
| 30 | 11¼ lb | 21 lb | 14 lb |
| 40 | 15 lb | 27 lb | 19 lb |
| 50 | 18¾ lb | 34 lb | 24 lb |
| 75 | 28 lb | 51 lb | 36 lb |
| 100 | 37½ lb | 68 lb | 48 lb |
The "2nd main" column is not a typo: when burgers, ribs, or chicken share the menu, guests take smaller portions of each, so each main drops to about 70%. Planning two full-portion mains is the classic way to end up with 15 lb of leftover pork.
25 adults, pulled pork sandwiches, burgers also on the menu, normal appetites: 25 × 6 oz = 150 oz cooked ≈ 9.4 lb; with the second main at 70%, that's about 6.6 lb cooked; ÷ 0.55 = 12 lb raw — two medium butts. Add the burgers, sides, drinks, and ice, and you have the full shop. That's exactly what the planner does for the whole menu at once:
Plan the whole menu — free plannerHow many sandwiches does a pound of pulled pork make? At 6 oz of cooked meat per sandwich and 55% yield, one raw pound makes about 1½ sandwiches; a 10-lb raw butt makes roughly 14–15 sandwiches.
Boneless or bone-in? Bone-in butts are usually cheaper per pound and the bone is a small share of the weight; the 55% yield figure already assumes a typical bone-in butt.
How long does it keep? Refrigerated leftovers keep 3–4 days; frozen pulled pork keeps 3–4 months and reheats well — a good reason to use the leftovers bump instead of cutting it close.