How heavy is a tiger?

It depends on the subspecies. Male Siberians can weigh more than 600 pounds on occasion, and so can male Bengals. The Sumatran and South China subspecies rarely reach 320 pounds. Tigresses are smaller than males by one quarter in weight, and average a foot shorter.

Tigers weigh from 500 - 700 pounds (average tiger) The heaviest tiger was 857 pounds and died in 1957.
Female Sumatran Tigers can weigh as little as 75 kg (165 pounds). Male Siberian Tigers can weigh as much as 306 kg (675 pounds). Tigers can weigh anywhere in between those two extremes, with the specific weight depending mainly on subspecies and sex.
It depends on the subspecies. Male Siberians can weigh more than 600 pounds on occasion, and so can male Bengals. The Sumatran and South China subspecies rarely reach 320 pounds. Tigresses are smaller than males by one quarter in weight, and average a foot shorter.