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*In 1979, American anthropologist Alfred E. Johnson Jr. used the dimensions of gorillas to estimate a [[femur]] length of {{cvt|54.4|cm|ftin|0}} and [[humerus]] length of {{cvt|62.7|cm|ftin|0}} for ''Gigantopithecus'', about 20–25% longer than those of gorillas.<ref name=Johnson1979>{{cite journal|first=A. E. Jr. |last=Johnson |year= 1979 |title= Skeletal Estimates of ''Gigantopithecus'' Based on a Gorilla Analogy|journal=Journal of Human Evolution|volume=8|issue=6|pages=585–587|doi=10.1016/0047-2484(79)90111-8|bibcode=1979JHumE...8..585J }}</ref>
*In 2017, Chinese palaeoanthropologist Yingqi Zhang and American anthropologist Terry Harrison suggested a body mass of {{convert|200|-|300|kg|abbr=in}}, though conceded that it is impossible to obtain a reliable body mass estimate without more complete remains.<ref name= ZhangHarrison2017/>
*In 2019, R. J. Hawley from the [[Tate Geological Museum]] wrote that it is unreasonable to reconstruct ''Gigantopithecus'' with bipedal standing height over {{cvt|230|cm|ftin|0}}.<ref>{{Cite journal |
The average maximum length of the upper [[canine tooth|canines]] for presumed males and females are {{convert|21.1|mm|abbr=in|frac=4}} and {{convert|15.4|mm|abbr=in|frac=2}}, respectively, and Mandible III (presumed male) is 40% larger than Mandible I (presumed female). These imply [[sexual dimorphism]], with males being larger than females. Such a high degree of dimorphism is only surpassed by gorillas among modern apes in canine size, and is surpassed by none for mandibular disparity.<ref name= ZhangHarrison2017/>
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