how many kg in 500 WHAT?!? your 500 has no unit, your question is invalid!
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500 mg = 0.0005 kg
500 carats is equivalent to about 0.1 kilograms.
1 kilogram and 500 grams !
.5 kg
There are 100000 centigrams in one kilogram. Therefore, 500 kilograms is equal to 500 x 100000 = 50000000 centigrams.