It depends on what you are weighing (steel, wheat wool etc). Stones vary in weight between 8 and 14 lb.
For human weight a stone is equal to 14 lb (approximately 62.3 Newtons if you are fastidious about mass and weight) or 6.35 kg.
20 stone (note the plural of stone is stone) is 280 lb. or 127 kg. (or of course 1246 N.)
Convert to pounds by multiplying by 14.
Then divide by 2.2 to get kilograms.
Answer = 259
21 stone is 133.4kg
Answer: 10 st = 63.5 kg
12 stone = about 76.2 kg
25 kilograms = 55.1 pounds.
5 stone = 31.75 kilograms.
First take the weight in Kilograms and multiply it by 0.453. This would give the weight in kilograms. So in this case the answer is 11.33 kilograms.
1 stone 5.5 pounds = 8.84 kilograms.
25 pounds = 11.34 kilograms.
3 kilograms = 0.47 stone
111 kilograms = 17.47 stone
7 stone is 44.5 kilograms.
55 kilograms is 8.7 stone.
66 kilograms is 10.4 stone.
8.48 stone is 53.85 kilograms.
64.5 kilograms = 10.1 stone