If you ment pounds then 80 pounds=36.2873896 Kilograms
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57 kilograms = 125.7 pounds.
On Earth only, 80 kilograms of mass weighs 176.4 pounds. (rounded) In other places, its weight is different.
That would be 319.67 Ibs
(6 + 5/16) /2.2 = 2.896 kg
A kilogram is 1000 grams. A pound(troy) is 373.24 grams or 0.37324 kilograms.