text: how much does a turtle weigh?   <it depends on the species and age.the leatherback is the largest, measuring six or seven feet (2 m) in length at maturity, and three to five feet (1 to 1.5 m) in width, weighing up to 1300 pounds (600 kg). most other species are smaller being two to four feet in length (0.5 to 1 m) and proportionally less wide.