Just the amount of explosives tells very little, the weight of the fragmentable shell would be more interesting to know. As half of this board knows already, the German "potato masher" was designed to be partially a concussion grenade, that kills and/or stuns by blast wave and doesn't send much shrapnel so that assault troops can charge while the grenade is still flying, so naturally it was mostly TNT and very little shrapnel. Most of the lethal power of any grenade comes from the shrapnel, as the blast wave dies off rather quickly - inversely cubed in relation to the increase in distance.