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Prime Rib & Beef Roast Cooking Time Calculator

Pick your beef roast and weight to get the USDA roasting time per pound, the oven temperature, the safe 145°F temperature and when to put it in.

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Good to know: Scope: beef rib roast (prime rib) bone-in or boneless, eye of round, round or rump, and whole or half tenderloin roasts cooked in a conventional oven, using the beef rows of the USDA FSIS holiday roasting timetable and the FoodSafety.gov roasting chart. When the two official charts differ, both times are shown. Excludes reverse-sear and low-temperature methods (USDA advises an oven of at least 325°F), sous vide, smokers, grills, slow and pressure cookers, convection settings, frozen roasts, pot roast, brisket, steaks, ground beef, lamb, pork and veal. Doneness levels below the USDA safe minimum are not given. Times are approximate; your oven, the roast’s shape and how cold it starts all change them. A food thermometer reading of 145°F, not the clock, tells you it is safe. Independent ToolsKo planner. Sources reviewed November 13, 2026.

How to use it (step by step)

  1. 1Pick your cut from the list. “Prime rib” is a beef rib roast; choose bone-in or boneless as on the label.
  2. 2Type the weight from the label in pounds, how long you will let it rest, and the time you want to eat.
  3. 3Read the oven temperature, the roasting time and when to put it in. Check it with a food thermometer in the thickest part before you take it out.

Words to know

Prime rib (rib roast)
A large beef roast cut from the rib section. Stores sell it bone-in (standing rib roast) or boneless.
Minutes per pound
How the charts give roasting time: multiply by the weight. A 6 lb roast at 23 minutes per pound needs about 2 hours 18 minutes.
Food thermometer
A probe you push into the thickest part of the meat, away from bone and fat. It is the only reliable way to know the roast reached a safe 145°F.
Resting time
The minutes you leave the roast on the counter after the oven before carving. USDA says at least 3 minutes.

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Sources & methods

References checked November 11, 2026. Read each tool’s scope and assumptions before relying on its result.

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