8kg is 1.3 stone
51 kg = 8 stone
8 stone is 50.8 kg
About 6.35 kg in one stone.
1 stone = 6.35kg
21.5 kg = 3.3 stone
98 kg = 15.43 stone
6 stone = 38.10175 kg
12 kg = 1.8 stone
83 kg = about 13.1 stone.
8.10 stone = 51.44 kg. NB 8.10 stone is NOT 8 st 10 lbs, it is 8 stone 1.4 lbs.
19 stone = 120.655kg
1 stone = 6.4kg