One kilogram equals 0.157473 stones, to convert 21 kg to stones we have to multiply the amount of kg by 0.157473 to obtain amount in stones. 21 kg are equal to 21 x 0.157473 = 3.306936 stones.
The kilogram (kg) is the SI unit of mass. It is equal to the mass of the international prototype of the kilogram. This prototype is a platinum-iridium international prototype kept at the International Bureau of Weights and Measures. One kg is approximately equal to 2.20462262 pounds.
The stone (symbol: st) is a unit of measure equal to 14 pounds (lb) avoirdupois, or 6.3503 kilograms (kg). This unit of measurement is used in Australia, Great Britain, and Ireland for measuring human body weight.
To calculate a kilogram value to the corresponding value in stones, just multiply the quantity in kilogram by 0.157473 (the conversion factor).
Stones = kilograms * 0.157473
The factor 0.157473 is the result from the division 1 / 6.35029 (pound definition). Therefore, another way would be:
Stones = Kilograms / 6.35029
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