Rule of 5 Prime Rib

This recipe will give you a soft perfect Prime Rib every time, and requires very little effort and a calculator. See math is fun and delicious.
The rule of 5:
500°F for 5 minutes/lb of roast. Then leave in oven for 2 more hours with oven off.
Let’s get to work.


  1. 1 Prime Rib roast (bone in)
  2. 1/2 lb garlic butter
  3. Herbs of your choice


  1. First preheat oven to 500°F. While that is warming up let’s do the math. For this purpose we will use the roast I have here. It is 11.2 lbs.

  2. Let’s do the math. 5 minutes per pound. 11.25 × 5 = 56.25 minutes. Now we round up to the nearest minute. So our time will be 57 minutes of cooking time

  3. Now let’s rub our roast will the garlic butter.

  4. Sprinkle with your desired herbs. Can be anything from salt and pepper, to a prime rib rub. Again your choice.

  5. Now we cook it in oven for exactly the calculated time. 57 minutes. Once the time has finished. Shut oven off. Set timer for 2 more hours. DO NOT OPEN OVEN. This is extremely important or it will not be cooked properly.

  6. Once the 2 hours has finished. Your roast is ready to serve. I debone it before cutting.

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