This makes it more accurate than determining calorie needs based on total bodyweight alone. (bodybuildingforyou.com)
2) I don't think any formula which uses total bodyweight to calculate protein requirements is very accurate. (perfecthealthdiet.com)
About 10 years ago, I did an experiment on myself to see just how much weight I could gain in a week (keep in mind, I was just aiming for total bodyweight, which includes muscle, water and fat). (hardgainermusclebuilding.com)