How heavy is a white lion?

The answer is: the weight of a lion is not related to its fur colour.

White lion is a rare colour variant of the lion species, featuring a near-white coat. The weight range of a white lion is not different from that of other lion subspecies. Male lions typically weigh between 160 to 250 kg (353 to 551 lbs), while females are generally smaller, weighing around 120 to 185 kg (265 to 408 lbs).