WEBCommon Hippo: 1.4 to 5 tons; Pygmy Hippo: 160 to 275 kilograms (352-606 pounds) Size. Common Hippo: 2 to 5 meters in length (6 to 16.5 feet) and stand about 1.5 meters tall (5 feet); Pygmy Hippo: 1.5 to 1.75 meters in length (about 5 feet) and stand about 1 meter tall (3 feet) Life span. Up to 50 years in the wild.