Heat ham, the U.S. Department of Agriculture says, until the center of the ham reaches 140 degrees, allowing 18 to 24 minutes per pound for half, bone-in hams and 10 to 15 minutes for boneless.

A whole ham typically weighs more than 10 pounds. That's a large hunk to wrestle with in a roasting pan, which is why you'll find so many half hams (whole hams cut in half).

If you have a whole bone-in ham between 10 and 14 pounds, cook it at 325°F for 18 to 20 minutes per pound. If you have half of a bone-in ham between 5 and 7 pounds, cook at 325°F for 22 to 25 ...

How big is a whole ham? Big! Most boneless spiral hams weigh about five bones, but bone-in cuts will weigh even more, at least 10 to 15 pounds — note, this could serve 30 people or then some.

For whole bone-in hams weighing 10 to 14 pounds, cook the ham at 325°F for 18 to 20 minutes per pound. The internal temperature should be 145°F. Allow the ham to rest for three minutes.