On average, tigers are 4.8 to 9.5 feet (1.5 to 2.9 m) long and weigh 165 to 716 lbs. (75 to 325 kilograms). The largest tigers, the Siberian, also called Amur, are 10.75 feet (3.3 meters) long and weigh 660 lbs. (300 kg), according to National Geographic. The smallest tiger is the Sumatran tiger. They grow to 5 to 12 feet (1.5 to 3.7 m) and weigh 143-670 lbs. (65-305 kg), according to the Woodland Park Zoo. Tigers also have very long tails, which can add 2.3 to 3.6 feet (0.7 to 1.1 m) to their overall length.