Only lions live in prides and they can get quite large (approximately 30 cats) but typically consist of less than ten or fifteen individuals, including cubs.
This is from wikipedia: The term big cat - which is not a biological classification - is used informally to distinguish the larger cat species from smaller ones. One definition of "big cat" includes...
The size of a cat can vary greatly, depending on its breed or lineage. The average weight of an adult cat is between 4 kilograms (8 lb ) and 5 kilograms (11 lb). However, some much larger breeds such...