In Stuart Mc Roberts Brawn (the natural hardgainers bible some might say) it highlights John Mc Callum's theory of reasonable expectations for full size potential for a natural athlete based on wrist size.
Obviously everyone is differnt with varing structure even between upper and lower body. This is a ROUGH estimate
here it is
chest 6.5 x wrist
hips 85pc of chest
waist 70pc of chest
thigh 53pc of chest
neck 37pc of chest
upper arm 36pc of chest
calf 34pc of chest
forearm 29pc of chest
In Brawn there is a publication of David P Willoughby's 'optimum ideal standard'. this was a goal for youths and men of AVERAGE muscular potential.
Willoughby also showed the wrist to ankle girth to be 79% to 82%. if you compare your own you can see whether or not you have a noticeably heavier lower-upper body structure.
Willoughby also advised how to measure.
wrist: below the styloid process of the ulna, ie on the hand side of it with hand open. i think that means above the bone.
leg girth: all measurements to be taken with the legs straight but relaxed, including the ankle at the smallest part. knee across center or knee cap
thighs: largest circumference
waist:at the smallest point withhout pulling the waist in
hips: at the largest point with feet together
chest: level of nipples not expanded
upper arm: flexed at largest point
forearm: largest point clenched straight. not with fist turned towards body
neck: smallest point
delt: measured from lateral head of one delt to another. i take this using eye level high cupboard doors.
1Height 8 Waist
2 Weight 9 hips
3Neck 10 thighs
4Bicep 11 knees
5Forearm 12 calves
6Wrist 13 ankles
7Chest 14 bi deltoid
1 2 3 4 5 6 7 8 9 10 11 12 13 14
60 114 14.1 13.2 11.0 6.3 36.7 27.5 33.0 19.8 12.9 13.2 7.7 17.2
62 126 14.5 13.6 11.3 6.5 37.9 28.4 34.1 20.5 13.3 13.6 8.0 17.7
64 138 15.0 14.1 11.7 6.7 39.1 29.3 35.2 21.1 13.8 14.1 8.3 18.2
66 151 15.4 14.5 12.1 6.9 40.3 30.2 36.3 21.8 14.2 14.5 8.5 18.7
68 165 15.9 15.0 12.5 7.1 41.5 31.1 37.4 22.4 14.7 15.0 8.8 19.2
70 180 16.4 15.4 12.8 7.3 42.8 32.1 38.5 23.1 15.1 15.4 9.0 19.8
72 196 16.8 15.8 13.2 7.5 44.0 33.0 39.6 23.7 15.5 15.8 9.3 20.3
74 213 17.3 16.3 13.6 7.7 45.3 33.9 40.7 24.4 16.0 16.3 9.6 20.9
76 231 17.8 16.7 13.9 8.0 46.5 34.8 41.8 25.1 16.4 16.7 9.8 21.4
78 250 18.3 17.2 14.3 8.2 47.7 35.8 42.9 25.7 16.8 17.2 10.1 21.9