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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.
.1 grams is equal to 100 milligrams.
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.
1000 mg = 1 gram so 900 mg = 900/100 g = 0.9 g. Simple!