How large was the brain of Ardipithecus ramidus?

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skeleton of “Ardi” — Ardipithecus Reconstructed frontal view of the skeleton of “Ardi,” a specimen belonging to the early hominid species *Ardipithecus ramidus*.

The brain of Ardipithecus ramidus was small, with a cranial capacity of approximately 300–350 cubic centimeters (18.3–21.4 cubic inches). This volume is equivalent to a brain weight of about 300–350 grams (10.6–12.3 ounces) and is similar in size to that of modern chimpanzees.12