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Last Updated on October 20, 2022

# How Do You Calculate Cooking Time For Prime Rib?

Calculate the actual weight by 15 (minutes per pound) and then divide that number by 60 to get your approximate time. For example: A 7.89 pound roast x 15 mins per pound = 118.35 minutes / 60 minutes per hour = 1.97 hours (2 hours). According to our formula, an 8-pound roast will take about 2 hours to cook.

### How many minutes per pound do you cook a prime rib at 350?

Either way, the main cooking is done at 350 degrees for 16 to 18 minutes a pound, to an internal temperature of 120 degrees. For a 7-pound roast, that’s going to be about two hours.

### How long does a prime rib take to cook per pound?

In a 225 degree F oven: Medium-rare: 30 to 35 minutes per pound. Medium: 35 to 40 minutes per pound. Medium-well: 40 to 45 minutes per pound.

### How long does it take to cook a 10 pound prime rib at 325?

For example, with a 10 pound roast, you would expect 2 hours of total cooking time for rare (15 minutes at 500° and 1 3/4 hours at 325°).

### What temperature and how long do you cook prime rib for?

Start by cooking your prime rib at 500°F for 15 minutes and then lower the oven temperature to 325° F and cook for 10-12 min per pound for rare prime rib, or 13-14 min per pound for medium rare prime rib, or 14-15 min per pound for medium well prime rib. A meat thermometer is essential to ensure you cook it perfectly!