How long to cook 5lb beef roast in roasting pan?

To cook a 5-pound beef roast in a roasting pan, you should typically roast it in an oven preheated to 325°F (163°C) for about 20 to 25 minutes per pound. This means the cooking time will be approximately 1 hour and 40 minutes to 2 hours and 5 minutes. Always use a meat thermometer to ensure the roast reaches the desired internal temperature—135°F (57°C) for medium-rare or 145°F (63°C) for medium. Let it rest for at least 15-20 minutes before slicing.