Actually, neither, but its weight is much closer to a gram than a kilogram. Remember, a kilo is the weight of one litre of water, and a penny is much, much lighter.
Actual weights:
US "penny" (really a cent) : 2.5 gm.
Canadian "penny" (again, a cent) : 2.35 gm
British penny : 3.56 gm
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closer to gram
lots of kilograms
A dime only weighs on gram roughly. A nickel weighs 4.5 grams. 1 kilogram (1kg) is 1000 g (grams). A paper clip weighs one gram also.
Kilogram.
Oh, dude, a gram weighs 1 gram! Like, that's literally the definition of a gram, it's a unit of mass in the metric system equal to one thousandth of a kilogram. So, if you ever need to weigh out a gram of something, just remember it's gonna be, you know, a gram.