The identity/core/soul of a human is in the brain. So we could weight the brain to give the energy which is equal to its mass times the speed of light in the vacuum squared, plus some other less significant kinds/sources of energy. However, what's important here is not the substance of the brain itself, but rather the patterns contained in it (which could also be contained in other types of substance) since this is what constitute the essence of the human soul. Therefore, the human soul is not a kind of energy, but rather a kind of information.