This table is taken from Runequest (6th Edition), and is intended for humanoid creatures.

Height is the primary SIZ determiner, and weight ranges are given for body morphologies within that height range.

Human(oid) Size (SIZ)

SIZHeight (cm)Lithe (Kg)Medium (Kg)Heavy (Kg)
11-451-51-71-9
246-806-108-1410-18
381-10511-1515-2119-27
4106-12016-2022-2828-36
5121-13021-2529-3537-45
6131-14026-3036-4246-54
7141-15031-3543-4955-63
8151-15536-4050-5664-72
9156-16041-4557-6373-81
10161-16546-5064-7082-90
11166-17051-5571-7791-99
12171-17556-6078-84100-108
13176-18061-6585-91109-117
14181-18566-7092-98118-126
15186-19071-7599-105127-135
16191-19576-80106-112136-144
17196-20081-85113-119145-153
18201-20586-90120-126154-162
19206-21091-95127-133163-171
20211-21596-100134-140172-180
21216-220101-105141-147181-189
+1+12cm+10Kg+14Kg+18Kg