Comment by machomaster

Practically speaking it doesn't matter. Just use your healthy (men 15-20% fat; women +8%) weight and calculate based on that.

If you are healthy fat percentage, just use your own weight. If you are a bit highter, and can financially and practically afford it, just use your weight as well. Won't hurt and might actually help a bit.

So it is only a concern for severely obese people. If you are 50+kg overweight, you can scale it down a bit.

Similarly, these obese people shouldn't use the "my current diet - 500kcal a day reduction" which is sensible for already lean bodybuilders. They should just use the "my maintenance diet if I were of healthy weight".