90 kilograms is equivalent to 14.17 stone. Alternatively, it is also equivalent to 198.42 pounds or 14 stone and 2.45 pounds. Here are the conversion factors:

• 1 kilogram is approximately equal to 0.1575 stones.
• 1 stone is equal to 14 pounds.

Therefore, to convert 90 kilograms to stone, we can multiply 90 by 0.1575 to get 14.17500 stones. Rounding this to two decimal places gives us 14.17 stone.