# Calculate PPM?

## Answer

To calculate ppm, you must convert the terms in an equation to one millionths. The abbreviation ppm stands for parts per million. This unit of counting is used in manufacturing and for other industrial purposes. It is often used to measure quality control and performance. For example, if a company makes 1,000,000 products a year and 2500 of them are defective, the ppm rate of defects is 2,500. If a company makes a shipment of 1,000 pieces of something, and 25 of them are defective, that could be extrapolated to a rate of 25,000 ppm.
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