The maximum known weight for females was 240 kg. Although tigers from Turkestan never reached the size of Far Eastern tigers, there are records of very large individuals of the former population.Weights of up to 318 kg (700 lb) have been recorded and exceptionally large males weighing up to 384 kg (847 lb) are mentioned in the literature but, according to Mazak, none of these cases can be confirmed via reliable sources. A further unconfirmed report tells of a male tiger shot in the Sikhote-Alin Mountains in 1950 weighing 384.8 kg (846.6 lb).
The "Siberian Tiger Project", which has operated from Sikhote-Alin Zapovednik since 1992, found that 206 kg (454.2 lb) seemed to be the largest that they were able to verify, albeit from a limited number of specimens. According to modern research of wild Siberian tigers in Sikhote-Alin, an average adult male tiger (>35 months) weighs 176.4 kg (the average asymptotic limit, computed by use of the Michaelis-Menten formula, gives 222.3 kg for male tigers) and an adult tigress 117.9 kg. The mean weight of historical Siberian tigers is supposed to be higher: 215.3 kg for male tigers and 137.5 kg fore females. At least one authority suspects that this is the difference between real weights and hunter's estimates.