University of Maryland Extension

Converting from Parts Per Million (ppm) to Percent (%)

Q. I have a liquid manure analysis where the lab has stated the nutrient content in parts per million (ppm). How do I convert this information to percent (%) so I can enter the information correctly into NuMan Pro? (Posted June 5, 2008)

A. A percent is 10,000 parts per million. In order to express the results as a percent, divide the nutrient content (which is expressed in ppm) by 10,000. For example, if the reported value for P2O is 2,690 ppm, the calculation to convert to percent would be: 2,690 ppm ÷ 10,000 = 0.269%.

Maintained by the IET Department of the College of Agriculture and Natural Resources. © 2019. Web Accessibility