1 kilogram = 1000000 milligrams. You now have all the information required to work out, for yourself, the answer to this and similar questions.
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To convert 205 mg to kg, divide by 1,000 since there are 1,000 milligrams in a gram and 1,000 grams in a kilogram. So, 205 mg is equal to 0.205 kg.
1 mg = 0.000001 kg (one-millionth of a kilogram) 1 mg is a milligram, or 1/1000 of a gram (much smaller) 1 kg is a kilogram, or 1000 grams (much larger)
To convert mg to kg, divide by 1,000. 45654 mg = 45.654 kg.
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)
1000 mg = 1 g; 1000 g = 1 kg, therefore 1000 x 1000 or 1 000 000 mg/kg
To convert 12.3 mg per kg to a percentage, you would need to divide 12.3 mg by 1000 (to convert to grams) and then divide by the weight in kg. This percentage would indicate how much 12.3 mg is relative to the weight in kg.