123 mg to g

123 mg = 0.123 g

To convert milligrams to grams, divide the milligram value by 1,000. So 123 mg ÷ 1,000 = 0.123 grams.

No. A milligram measures mass and a millilitre volume: 123 milligrams is 0.123 grams, but how much space that fills depends on the substance. The two coincide only for liquids with the density of water, where 1 ml weighs 1 g.