These calculations are under the assumption that max height (100) is 6’0" like it is in GMod. This is so the player models will have accurate heights depending on which character that you port.
100 = 6’0"
99 = 5’11.3"
98 = 5’10.6"
97 = 5’9.8"
96 = 5’9.1"
95 = 5’8.4"
94 = 5’7.7"
93 = 5’7.0"
92 = 5’6.2"
91 = 5’5.5"
90 = 5’4.8"
89 = 5.4.1"
88 = 5’3.4"
87 = 5’2.6"
86 = 5’1.9
85 = 5’1.2"
84 = 5’0.5"
83 = 4.11’8"
82 = 4’11.0"
81 = 4’10.3"
80 = 4’9.6"
79 = 4’8.9"
78 = 4’8.2"
77 = 4’7.4"
76 = 4’6.7"
75 = 4.6.0"
74 = 4’5.3"
73 = 4.4.6"
72 = 4’3.8"
71 = 4’3.1"
70 = 4’2.4"
69 = 4’1.7"
68 = 4’1.0"
67 = 4’0.2"
66 = 3’11.5"
64 = 3’10.1"
63 = 3’9.4"
62 = 3’8.6"
61= 3’7.9"
60 = 3’7.2"
59 = 3’6.5"
58 = 3’5.8"
57 = 3’5.0"
56 = 3’4.3"
55 = 3’3.6"
54 = 3’2.9"
53 = 3’2.2"
52 = 3’1.4"
51 = 3’0.7"
50 = 3’0.0"