A full prime rib consists of seven ribs (ribs 6 through 12). Butchers often split this into two distinct sections:
The number of ribs in a roast is a more reliable way to estimate serving sizes than weight alone because rib sizes vary by animal. One bone serves two people .
My Honest Review of Costco’s Prime Rib (Types, Cost & More)
Includes ribs 6–9. This end is fattier with more "ribeye cap" (the highly prized, flavorful outer muscle). It is the better choice for those who prioritize flavor and richness over lean meat. 4. Shopping Tips for Best Value
Plan for 1 pound per person . The bones account for roughly 25%–35% of the total weight but provide essential flavor and protection during roasting.
Add an extra 1/4 pound per person to your calculation if you want enough for sandwiches the next day. 2. Estimating by Rib Count
Note: For large groups over 14 people, experts from YouTube recommend buying two uniform-sized roasts (e.g., two 5-bone roasts) rather than one massive one to ensure they cook evenly.
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