How heavy is the largest kidney stone ever discovered?

The heaviest known kidney stone weighs 2.5 lbs or 1.12 kg and is the size of a coconut.

Is the cat’s information correct? Send a message. The 1.36 kg number mentioned in books and the interwebs failed to produce a source. This cat believes it’s a myth, which originated after swapping the units for this kidney stone – 620 g is roughly equal to 1.36 lb.