# How Do I Convert Mg/l To Ppm?

Mg/l stands for milligrams per litre and it is a unit of measurement of mass concentration that shows how many grams of a substance are present in one litre of a liquid or gaseous mixture. The unit milligrams per litre is often used in the field of medicine and when writing out prescriptions. Ppm stands for parts per million which means out of a million, just as percent means out of a hundred. This unit is used to express very dilute concentrations of a solution.

One ppm is the equivalent of 1 milligram of a substance per litre of water. A litre of water weighs 1 kilogram (kg) which is the equivalent of 1000 grams (g). And in case you didn’t know, 1 milligram (mg) is a thousandth of a gram. So one kilogram is the same as 1 million milligrams. So 180 mg/l equals 180 mg/kg which equals 180 mg/million mg which gives you 180 ppm.

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500 ppm=how many mg/l ?
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Mg/l stands for milligrams per liter; ppm stands for parts per million (presumably by weight). Now a liter of water weighs 1 kg (killogram) by definition, which is a thousand grams. A milligram is a thousandth of a gram. Therefore, a kg is 1 million mg. So 182.5 mg/l = 182.5 mg/kg = 182.5 mg/million mg = 182.5 ppm.
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Anonymous commented
Many thanks. It all makes sense now you have explained it. I shall get on with the home brew. Once again many thanks. 