A milligram is a measure of mass. A linear measure refers to length. The two measure different things and, according to basic principles of dimensional analysis, conversion from one to the other is not valid.
Your question is like asking how many kilograms away is the moon or (although mass and weight are not quite the same thing) ,how many metres you weigh?
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This is not a valid conversion; milligrams (mg) and grams (g) are measures of weight or mass and mL (milliliters) is a measure of volume.
You would give 4ml.
1 MG
1 gram is 1000 milligrams, so 5 grams is 5000 milligrams, which is more than 43 milligrams.
1ml of water is 1 g or 1000 mg % = 5/1000 x 100 = 0.5%