6.73 milligrams = 6.73 × 10-6 kilograms (0.00000673 kg)
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1000 mg = 1 g; 1000 g = 1 kg, therefore 1000 x 1000 or 1 000 000 mg/kg
730 mg is equal to 0.73 grams. To convert grams to kilograms, you divide by 1000, so 0.73 grams is equal to 0.00073 kilograms.
0.25 kg is equal to 250,000 mg. To convert kilograms to milligrams, you multiply by 1,000, since there are 1,000 milligrams in 1 gram and 1,000 grams in 1 kilogram.
1 mg = .001 Kg.Inversely, 1 Kg = 1000 mg
Since there are 1000 mg in 1 gram, and 1000 g in 1 kg, there are (1000 x 1000) mg in 1 kg, which is 1,000,000 mg in 1 kg. Or conversely, there are 0.000001 kg in 1 mg (that's 10-6 kg)