The calories in a venison steak will vary with the type of cut as well as how you cook it. The two most common types of venison steaks are the loin and top round cuts.
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According to the U.S. Department of Agriculture, a typical broiled venison loin steak weighs 54 g, around 2 oz., and has 81 calories. A broiled venison top round steak has 155 calories in a 102 g steak.
Calories from Fat
MedlinePlus notes that each g of fat has 9 calories. A venison loin steak has a little more than 1 g of fat has not quite 12 calories from fat. A venison top round steak has almost 2 g of fat for almost 18 calories from fat.
Calories from Protein
A single g of protein has four calories. A venison loin steak has more than 16 g of protein, giving it more than 65 calories from protein. A venison top round steak has more than 32 g of protein for 128 calories from protein.