Prime Rib Calculator

Prime rib (standing rib roast) planning combines pounds per guest with roast timing that depends on doneness, bone-in vs boneless, sear time, and rest. Bone-in roasts often feed more generously per pound because bones insulate and guests expect thicker slices.

Minutes-per-pound tables vary by target internal temperature — rare runs shorter than well done. This calculator applies common planning rates, adds sear time, and subtracts a small adjustment for boneless roasts before rest.

Resting 20–30 minutes after the oven is essential — carryover cooking raises internal temperature and juices redistribute. The serve-time schedule includes rest so carving happens at your target clock, not when the roast leaves the oven.

Example: 8 guests at 1 lb per person → 8 lb bone-in roast, medium-rare → roughly 2½ hours total oven work including sear — back up from 6:00 PM serve to mid-afternoon start. Use a probe thermometer; oven calibration and roast shape change real times.

USDA recommends 145°F minimum internal for beef roasts with a rest — many prime rib hosts pull earlier for rare or medium-rare centers. Always verify with a thermometer rather than time alone.

Let the roast sit at room temperature 1–2 hours before searing for more even cooking — food safety limits apply in warm kitchens; do not leave unrefrigerated indefinitely.

Pair with stuffing and Christmas dinner timing when sides compete for oven space. The turkey size calculator helps if poultry shares the holiday table.