This is one of the largest species of rhinoceros beetles in Southeast Asia, sometimes exceeding 7 cm in length.
As is the case with many large scarab beetles, sexual dimorphism is very obvious in this species. The males have well developed horns, while the females have none at all. The male’s horns are not identical: one is forked, and projects over the insect’s head, while the second is smaller, and attached to its thorax. The length of the horns depends greatly on the beetle’s diet as a larva.