Worlds biggest cat that ever lived were called "smilodon". These were the saber teeth cats that are dead out with last ice age, 10,000 years ago. They were weight between 250 and 360 kg (550-790 lb). It was 1.2 m (47 in) tall, 2.1 m (83 in) long, Its upper canines reached 28 cm (11 in) and protruded up to 17 cm (6.7 in) out of the lower jaw.
Today, the largest cats are "Siberian tigers". Males can weight up to 320 kg (700 lb), The male with largely assured references was 350 cm (138 in) "over curves" (3,30 m/130 in. between pegs) in total length. The largest tiger ever was male shot in the Sikhote-Alin Mountains in 1950 weighing 384.8 kg (846.6 lb) and measuring 3.48 m (11.5 ft). Unfortunately, this cat is on the verge of extinction, excessive catching, for fur and for traditional Chinese medicine, led to the fact that today only a few thousand left in the wild, and western parts of Siberia was completely extinguished.
Today, the largest single cat is a "Liger", it means that his father was a lion and mother was a tiger. It weight almost 450 kg (900 lb), and is 12 feet long. It can eat up to 50 kg (100 lb) in one meal, since this kind occurred in a zoo or a reserve only, feed them every day, and eat only 10 kg (20 lb) per day. Valley of the Kings animal sanctuary in Wisconsin had a male liger named Nook who weighed around 550 kg (1.213 lb), and died in 2007 at 21 years old, it was the largest cat ever confirmed.
It is interesting that if father is a lion and mother is a tiger, then the offspring are called "Liger", and offspring's are giants as these are above. But if father is tiger and mother lioness, then the offspring are called "Tal", and they are dwarfs.