About 6.35 kg in one stone.
1 stone = 6.35kg
6 stone = 38.10175 kg
83 kg = about 13.1 stone.
21.5 kg = 3.3 stone
98 kg = 15.43 stone
12 kg = 1.8 stone
8 stone = 50.8 kg
19 stone = 120.655kg
1 kilogram = 0.157473044 stoneSo, 55kg = 8.66 stone
80 kg= 12.5 stone
51 kg = 8 stone
21 kg = 3.3 stone