A gram is a unit of measurement for mass or weight in the metric system. There are 1000 grams in a kilogram, so 500 grams would be a half a kilogram. In US customary units, 500 grams is a little more than a pound.
When converting from metric to US customary units, weight is commonly converted into either pounds or ounces. One gram is equal to 0.0352 ounces, so 500 grams converts to 17.637 ounces. If pounds are to be used rather than ounces, then first convert the 500 grams to half a kilogram. One kilogram is equal to 2.2 pounds, so 500 grams equals 1.1 pounds.