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Parts Per Million (ppm)

ppm means "parts per million".

Here is what you need to do the conversions.

  1. There are 1000 mg (milligrams) per g (gram) ("milli" means thousandth).
  2. There are 1000 g (micrograms or mcg) per mg (milligram).
  3. Because of 1 and 2, there are 1 million (1,000,000) g (micrograms or mcg) per g (gram) ("micro" means millionth).


  4. So,

  5. 1 part per million (ppm) for a 1g sample is 1 g or .001 mg.
    (Because there are 1 million micrograms per gram.)
  6. 1 part per million (ppm) for a 100g sample is 100 g or .1 mg.
  7. 604 parts per million (ppm) for a 100g sample is 60,400 g or 60.4 mg.

If the sample size is 100g:

To convert parts per million (ppm) per 100g sample to mg (milligrams), divide by 10.
To convert parts per million (ppm) per 100g sample to g (micrograms), multiply by 100.

If the sample size is other than 100g:

To convert parts per million (ppm) per X g sample to mg (milligrams), multiply by X and divide by 1000.
To convert parts per million (ppm) per X g sample to g (micrograms), multiply by X.

For example, if your sample size is 28g, then

5 ppm is 140 g (micrograms) = 5 x 28
5 ppm is .14 mg (milligrams) = 5 x 28 / 1000