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8.5 stone = 53.98 kilograms.
To convert stone (st) to kilogram (kg), you can multiply the weight in stone by 6.35. This is because 1 stone is equal to 6.35 kilograms. For example, to convert 10 stone to kilograms, you would multiply 10 by 6.35 to get the result of 63.5 kilograms.
152.41 kg
stone is weight, kilometre is distance. can't convert if you mean kilograms it's 66.68 kg
You divide the mass by the density. Different types of stone, of course, may have different densities.