In early studies, it is suggested that Beelzebufo had snout-vent lengths of up to 42.5 cm .However in later studies, animals of this species are estimated to have grown to at least 23.2 cm in snout-vent length, which is around the size a modern African bullfrog can reach. The head of Beelzebufo was very big, and bones of the skull roof show a rugous external surface, indicating at least parts of the head may have borne bony scales, called scutes. The skull sutures are open in even the largest specimens of Beelzebufo, showing that it might have grown even bigger.
