Anyone else not realize that Leatherback Turtles were so huge? Adults average 1–1.75 m (3.3–5.74 ft) in carapace length, 1.83–2.2 m (6.0–7.2 ft) in total length and weigh 250 to 700 kg (550 to 1,500 lb). The largest ever found, however, was over 3 metres (9.8 ft) from head to tail, including a carapace length of over 2.2 metres (7.2 ft), and weighed 916 kilograms (2,020 lb).