1.5 st = 9.52543 kg
15 kilograms = 2.36 stones
1500 of course !
15000 grams.
Remember K H D | d c m (kilo, hecto, deka, (liter, meter, gram), deci, centi, milli). These are the denominations you need to list when converting metric units. Kilograms are three places to the left...