There are 80 parts of gold per million parts of iron in this example. (A kilogram is one million milligrams.) Using the example of 200 mg of gold mixed with 2.5 kg of iron: Divide the mass of the first solid in milligrams by the mass of the second solid in kilograms. To calculate the PPM of one solid mixed with another, you compare the mass of the two substances. Then, multiply 0.01 by 1,000,000 to achieve the answer of 10,000 defective parts per million parts produced. For example, if you have 100 defective products in 10,000 manufactured pieces, divide 100 by 10,000 to arrive at the result of 0.01 or 1 percent of the total. The basic formula is weight (or number of defects) divided by volume multiplied by 1,000,000 – or w/v x 1,000,000. This formula is used by people in the agricultural industry for fertilizer calculations, by water treatment professionals, in swimming pool chlorine calculations, and in laboratories by chemists and others. The basic formula for PPM starts with dividing the weight or number of defects by the volume and then multiplying the result by 1,000,000. Parts per million calculations are used for measuring small concentrations in a solution, solid and gas or the number of defects in manufacturing.
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