Ham Cooking Time Calculator

A fully cooked (city) ham, whether whole or spiral-cut, is safe to eat cold and only needs to be reheated to an internal temperature of 140°F for the best warm-served texture and flavor.

A fresh, uncooked ham is raw pork and must be cooked to a minimum internal temperature of 145°F, followed by a 3-minute rest, per USDA guidance.

The pre-cut slices expose more surface area to heat, so a spiral ham reheats more quickly and evenly than an equivalent-weight whole ham — but that same surface area also makes it dry out faster if left uncovered too long.