The imperial (avoirdupois, or international) pound is officially defined as 453.59237 grams.
Pounds to Kilograms (lbs to kg)
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The kilogram is the base unit of mass in the International (SI) System of Units, and is accepted on a day-to-day basis as a unit of weight (the gravitational force acting on any given object).
The kilogram is almost exactly equal to the mass of one litre of water.