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.)
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