1000
100 gr because 1 kg = 1000 gr
1 gr(grain) is equal to about 1/64th of a mg so 1 mg(milligram) is equal to 0.0154323584 gr(grains)
1 milligram = 0.001 grams
The prefix 'milli' means one thousandth, 1/1000, or 103. So 1 milligram equals 1/1000 grams (1mg = 1/1000 gr). Multiply both sides of the equation by 1000 to get the answer: (1000·1 mg=1000·1/1000 gr simplifies to 1000 mg = 1 gr).Correct, 1 gram is 1,000 milligrams.