So the Hans Benedict formula (which has been in use since 1919) is directly weight related.
The Katch-McArdle and Cunningham try to be more specific and relate to the Lean Body Mass (LBM).
However -- since LBM is reasonably correlated with overall weight -- then we can assume that (all else being equal) the fatter person has a higher BMR.
Comments
So the Hans Benedict formula (which has been in use since 1919) is directly weight related.
The Katch-McArdle and Cunningham try to be more specific and relate to the Lean Body Mass (LBM).
However -- since LBM is reasonably correlated with overall weight -- then we can assume that (all else being equal) the fatter person has a higher BMR.