How To Convert mg/kg Into ppm?

Question asked by Edward James:

Hello all,

Can someone please tell me how I can convert mg/kg into ppm (parts per million)? I can't seem to find the answer.



Follow-up responses...

Conversion Of mg/kg Into ppm

posted by Greg:

Parts per million (ppm) is commonly used as a measure of concentration (small levels) of something in water or soil.

Assuming you are converting the mass of a substance, the conversion of mg/kg to ppm is 1:1. To convert to parts per million, you don't need to do anything other than take the mg/kg off the end and add ppm on to the end.

mg/kg to pmm explanation

  • 1 mg = 0.001 grams
  • 1 kg = 1000 grams
  • 0.001 / 1000 = 1/1000000 = one ppm.

As noted at the top of this message, this only works for mass conversions (not liquid volume). There's a useful article about this on Engineering Toolbox, for more information.