About.com states that there are 300 calories in each serving of meatloaf. A single serving of meatloaf is equal to 12 ounces or 336 grams.
One serving of meatloaf has 81 calories from fat, 9 grams of total fat (3 of which is saturated fat), 40 milligrams of cholesterol, 600 milligrams of sodium, 36 grams of carbohydrates, 6 grams of dietary fiber, 17 grams of sugar and 18 grams of protein. Meatloaf is high in sugar. A serving of meatloaf contains 2 percent of recommended daily value for vitamin A, 30 percent for vitamin C, 8 percent for calcium and 10 percent for iron. Some foods similar to meatloaf include sausage, deli meats, poultry products, pork products and lamb products.