Prime Rib Cooking Time Calculator
A perfect standing rib roast is all about internal temperature. Enter the weight and your target doneness to get a roasting-time window and the exact temperatures to pull and rest to.
Prime Rib Cooking Time Calculator
Why use the Prime Rib Cooking Time Calculator
A pricey rib roast overcooked past your target is a costly mistake. Plan the time to the doneness you want.
How to get your numbers
- Roast weight in pounds.
- Your target doneness.
- Pull it about 5°F early — the temp climbs while it rests.
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How to use it
- Enter the roast weight in pounds.
- Choose your target doneness.
- Pull about 5°F early — carryover finishes it during the rest.
Frequently asked questions
How long do I cook prime rib?
Roughly 14–18 minutes per pound at 325°F depending on target doneness — but always confirm with a thermometer.
What temperature is prime rib for medium-rare?
Pull it at about 125°F and rest to 130°F for medium-rare. Carryover cooking raises the temperature about 5°F during the rest.
Should I rest a prime rib?
Yes — 20–30 minutes. The juices redistribute and the temperature climbs to its final target while it rests.
What is carryover cooking?
Residual heat that keeps cooking the roast after it leaves the oven, typically raising the internal temperature about 5°F. That is why you pull it early.
Bone-in or boneless prime rib?
Bone-in adds flavor and insulates the meat for more even cooking; boneless is easier to carve. Cooking times are similar.
What is the reverse-sear method for prime rib?
Roast low until just under target, rest, then blast the oven or sear the outside hot for a browned crust. It gives edge-to-edge doneness.
How much prime rib do I need per person?
About 1 lb of bone-in roast per person, or ½ lb boneless, allowing for hearty appetites at a holiday meal.
