Calculate Mg per Ml

Calculating milligrams (mg) per milliliter (ml) is a common task when you work with chemicals of all kinds. It is especially important when determining drug dosages, since the active ingredient in most drugs that are in liquid form is usually measured in mg per ml, or a percentage equivalent. A unit weight of 1 mg equals 0.001 g. A unit volume of 1 ml equals 0.001 l and is equivalent to 1 cubic cm.

## Instructions

1. Look up the density of a material in a table of densities (see References) if you want to determine how many milligrams are in 1 ml of the material. Density is usually expressed as a proportion of the weight of an equal volume of water. For example, the density of gasoline relative to water is 0.70.

2. Multiply the density of the material by 1,000 to find the milligrams per milliliter. A milliliter of water contains 1,000 mg. For the gasoline example, multiply 0.70 times 1,000. Thus, there are 700 mg of gasoline in 1 ml of gasoline.

3. Convert percentages of a drug to milligrams per milliliter. Most liquid drugs contain the active medication dissolved in water. The amount of the medication is often expressed as a percentage of the weight of water. For instance, a drug might be listed as a 2.5 percent solution, which means 2.5 percent of the weight of the liquid is active medicine.

4. Multiply the percentage by weight by 1,000 to find the milligrams per milliliter. For a 2.5 *percent solution*, you would multiply 0.025 by 1,000, which equals 25 ml. So, there are 25 mg of the drug in 1 ml of the solution.

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