"H. rudolfensis" is distinguished from "H. habilis" by larger size, but it is also argued that this species actually consists of male "H. habilis" specimens, assuming that "H. habilis" was sexually dimorphic and males were much larger than females. Because no bodily remains are definitely identified, body size estimates are largely based on the stature of "H. habilis". Using this, male "H. rudolfensis" may have averaged about in height and in weight, and females and . KNM-ER 1470 had a brain volume of about . Like other early "Homo", "H. rudolfensis" had large cheek teeth and thick enamel.