How many calories are in Whey Protein Powder?

The protein from whey protein powder contains 4 calories for each gram, so an average 30 gram serve should contain around 120 calories. Having said this, protein powder is not 100% pure and may contain additives as well as some carbohydrates and fat. You should select a whey protein powder with minimal to no carbs or fat, as they are more easily converted into fat stores. Fats are also especially high in calories with around 9 calories for each gram of fat.