The Per-Person Rule To Buy Prime Rib For A Party - Tasting Table
Briefly

Prime rib, an expensive yet delectable cut of beef, poses challenges for buyers regarding the appropriate amount to purchase for gatherings. A standard guideline suggests one pound per person for boned prime rib and half a pound for boneless. Understanding cuts is key; the chuck end is preferred for its superior flavor and moisture, while the loin end is leaner. When serving a larger group or as part of a buffet, adjusting portion sizes can help mitigate excessive leftovers without skimping on enjoyment.
Unfortunately, there isn't a definitive guide out there for how much prime rib to purchase for a crowd. However, there is a general rule of thumb.
One of the mistakes to avoid when cooking prime rib is ordering the loin end, which is leaner and more uniform. The fat that marbles the chuck end provides moisture and flavor.
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