Size: Kemp's Ridley is the smallest sea turtle at 30 inches long (.762m). The largest sea turtle is the leatherback - an adult can reach over six and a half feet long (over 1.8m). Adult female and male sea turtles are the same size.
Weight: Kemp's Ridley weighs between 80-100lbs (36-45 kg). Leatherback can weigh over 2,000 pounds (over 907 kg)
Lifespan: Up to 80 years.