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This calculator converts Magnesium (mg) to mmol/l, µmol/l, mg/dl, mg/100ml, mg%, mg/l, µg/ml, meq/l using mmol/l units. Magnesium is a mineral that is important for normal bone structure in the body. People get magnesium from their diet, but sometimes magnesium supplements are needed if magnesium levels are too low. Dietary intake of magnesium may be low, particularly among women.