Does not convert; milligrams (mg) and grams (g) are measures of weight or mass and mL (milliliters) is a measure of volume.
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1 liter of water weighs 1 kg so 1 ml of water weighs 1 mg so 5 ml of water weighs 5 mg
There are 1000 milligrams (mg) in a cubic centimeter (cc) of water, as 1 cc is equivalent to 1 milliliter (mL), and 1 mL of water has a mass of approximately 1000 mg. However, this conversion can vary for liquids with different densities. For liquids other than water, you would need to know the specific density to convert cc to mg accurately.
It looks like the 3.5 ml may be extraneous information. If 1 ml yields 250 mg, then you need 400/250 = 1.6 ml, to get 400 mg.
To determine how many 400 mcg tablets equal 1 ml, you need to know the concentration of the substance in mg/ml. If we assume that 400 mcg is equivalent to 0.4 mg, then if the concentration is 1 mg/ml, it would take 2 tablets (0.4 mg x 2 = 0.8 mg) to equal 1 ml. However, without specific concentration information, we cannot provide an exact answer. Please check the product's labeling for accurate dosing.
Does not convert; milligrams (mg) and grams (g) are measures of weight or mass and mL (milliliters) is a measure of volume.