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Prime Rib Cook Time

CookingCooking Times and Temperatures
Cut
Doneness
Roasting time at 350 °F —
Total minutes
—
Take it out at
—
Temperature after resting
—
Rest before carving
—
Rate used
—

At 350 °F a bone-in prime rib takes roughly 13 minutes per pound for rare, 15 for medium-rare, 17 for medium and 20 for well done. An 8 lb roast cooked medium-rare needs about 2 hours; take it out at 125 °F and rest it 20 minutes so carryover brings it to about 135 °F.

About this tool

A standing rib roast is usually the most expensive thing on a holiday table, and the clock is what hosts plan dinner around. Enter the roast weight in pounds or kilograms, say whether it is bone-in or boneless, and pick a doneness. You get the roasting time at a steady 350 °F, the temperature to take it out at, the temperature it should reach after resting, and how long to rest it before carving. Boneless roasts get one extra minute per pound; without the bones conducting heat into the centre, the heat has further to travel. The time is a planning estimate: oven calibration, a roast straight from the fridge versus one tempered for an hour, and the shape of the cut all shift it, so a probe thermometer decides when it is done.

How to use it

  1. Enter the weight

    Type the trimmed weight from the butcher label and pick lb or kg in the attached unit box.

  2. Choose the cut

    Select bone-in for a standing rib roast or boneless for a rolled ribeye roast.

  3. Pick a doneness

    Rare, medium-rare, medium or well done sets both the minutes per pound and the target temperature.

  4. Read the pull temperature

    Start checking with a thermometer about 30 minutes before the estimate and remove the roast at the pull temperature shown.

Examples

6 lb bone-in, medium

Roast weight
6
Weight unit
lb
Cut
Bone-in
Doneness
Medium

Result Roasting time at 350 °F: 1 h 42 min
Total minutes: 102
Take it out at: 135 °F (57 °C)
Temperature after resting: 145 °F (63 °C)
Rest before carving: 20 min
Rate used: 17 min/lb

  1. Weight = 6 lb
  2. Rate at 350 °F for medium = 17 min/lb
  3. Time = 6 × 17 = 102 min = 1 h 42 min
  4. Pull at 145 − 10 °F carryover = 135 °F, then rest 20 min

At 17 minutes a pound the roast needs about 1 h 42 min, and comes out at 135 °F to coast up to the USDA 145 °F minimum while resting.

8 lb four-rib roast, medium-rare

Roast weight
8
Weight unit
lb
Cut
Bone-in
Doneness
Medium-rare

Result Roasting time at 350 °F: 2 h 0 min
Total minutes: 120
Take it out at: 125 °F (52 °C)
Temperature after resting: 135 °F (57 °C)
Rest before carving: 20 min
Rate used: 15 min/lb

  1. Weight = 8 lb
  2. Rate at 350 °F for medium-rare = 15 min/lb
  3. Time = 8 × 15 = 120 min = 2 h 0 min
  4. Pull at 135 − 10 °F carryover = 125 °F, then rest 20 min

8 × 15 min gives two hours; pull at 125 °F and let carryover lift it to about 135 °F.

3 kg boneless, medium

Roast weight
3
Weight unit
kg
Cut
Boneless
Doneness
Medium

Result Roasting time at 350 °F: 1 h 59 min
Total minutes: 119
Take it out at: 135 °F (57 °C)
Temperature after resting: 145 °F (63 °C)
Rest before carving: 20 min
Rate used: 18 min/lb

  1. Weight = 3 kg ÷ 0.4536 = 6.61 lb
  2. Rate at 350 °F for medium (boneless, +1 min/lb) = 18 min/lb
  3. Time = 6.61 × 18 = 119 min = 1 h 59 min
  4. Pull at 145 − 10 °F carryover = 135 °F, then rest 20 min

3 kg is 6.61 lb; at 18 minutes a pound for a boneless roast that is just under two hours.

How it is calculated

time = weight (lb) × rate (min/lb); pull temperature = final temperature − carryover

rate
13, 15, 17 or 20 min/lb at 350 °F for rare to well done; +1 for boneless
final temperature
125, 135, 145 or 155 °F after resting
carryover
5 °F under 5 lb, 10 °F from 5 lb up

Kilograms are converted at 0.45359237 kg per pound. The minutes-per-pound rates are common kitchen guidance for a roast that has stood at room temperature for about an hour. Large roasts keep cooking after they leave the oven, so the tool subtracts a carryover rise from the target to give the pull temperature. USDA FSIS lists 145 °F with a three-minute rest as the safe minimum for whole beef roasts; rare and medium-rare finish below it, and the tool warns when they do.

When not to use it

  • Reverse-searing at 225 to 250 °F, which takes far longer per pound.
  • Searing at 500 °F then switching the oven off, a closed-oven method with its own timing.
  • Sous vide rib roasts, where time depends on thickness, not weight.

Common mistakes

  • Using the untrimmed weight including the tied-on bones you removed.
  • Leaving the roast in until the thermometer reads the final temperature, then overshooting during the rest.
  • Opening the oven door repeatedly, which drops the temperature and stretches the time.
  • Carving straight away, so the juices run onto the board.

Frequently asked questions

How long per pound does prime rib cook at 350 °F?

About 13 minutes per pound for rare, 15 for medium-rare, 17 for medium and 20 for well done on a bone-in roast. Boneless roasts run roughly one minute per pound longer here. These rates assume the roast sat out for about an hour before going in.

What temperature should I take prime rib out of the oven?

Remove it 5 to 10 °F below the doneness you want. For medium-rare at 135 °F, a roast over 5 lb comes out at 125 °F; carryover heat finishes it during a 20-minute rest.

Does bone-in prime rib cook faster than boneless?

Slightly. The bones conduct heat and the standing roast exposes more surface, so a bone-in roast of the same weight usually finishes a little sooner. That is why the boneless option adds a minute per pound.

Is medium-rare prime rib safe to eat?

USDA FSIS sets 145 °F with a three-minute rest as the safe minimum for whole beef roasts. Medium-rare finishes around 135 °F, below that figure, which is why the tool shows a note for rare and medium-rare. Many cooks still serve it that way; the choice is the diner's.

How long should prime rib rest before carving?

Fifteen minutes for a small roast and about 20 minutes for one of 5 lb or more. Tent it loosely with foil so the crust stays crisp while the temperature evens out.

How much prime rib do I need per person?

A common rule is one rib bone for every two guests, or about 1 lb bone-in per person. An eight-guest dinner points to a four-rib roast of roughly 8 lb.

Cite this tool

Using this tool in an assignment, article or report? Copy a citation, or a link for your website.

APA

Tools Directory Editorial Team. (2026, October 27). Prime Rib Cook Time. Tools Directory. Retrieved October 27, 2026, from https://tools.milunir.com/cooking/cooking-times-and-temperatures/prime-rib-cook-time/

MLA

Tools Directory Editorial Team. “Prime Rib Cook Time.” Tools Directory, 27 Oct. 2026, https://tools.milunir.com/cooking/cooking-times-and-temperatures/prime-rib-cook-time/. Accessed 27 Oct. 2026.

Chicago

Tools Directory Editorial Team. “Prime Rib Cook Time.” Tools Directory. Last modified October 27, 2026. Accessed October 27, 2026. https://tools.milunir.com/cooking/cooking-times-and-temperatures/prime-rib-cook-time/.

Link<a href="https://tools.milunir.com/cooking/cooking-times-and-temperatures/prime-rib-cook-time/">Prime Rib Cook Time – Tools Directory</a>