This procedure is the opposite of what we just did above. How to Convert Percent Concentration to PPM or Parts Per Million When converting percent concentrations of anything to parts per million remember that a 1 % (concentration) = 10,000 ppm or parts per million. Thanks to Leroy Jenkins for technical editing to clarify this point. To convert an 8 percent concentration of substance X to parts per million of X (in whatever, air, water, gas)Ĩ.0 % (concentration) x 10,000 = 80,000 ppm Example of conversion from percentage concentration of a substance to parts per million or ppm Notice where we place the decimal point if you want to stay out of trouble. To convert 800 ppm of gas X to percentage of gas X in air divide the ppm by 10,000 Example of conversion from parts per million to the percentage concentration of a substance Just watch the decimal point and we can avoid embarrassment. If I make a Carbon monoxide (CO) measurement and my instrument tells me I've got 800 ppm of CO, and my hygienist asks me to write the report in percent concentrations what now? People often talk about concentrations without stating the 'in what' substance (Y) because they think we know what the heck they're talking about. We are calculating the percentage concentration of X in Y even if 'Y' is not being stated. ( Parts per million (ppm) of X ) divided by ( 10,000 ) = Percentage concentration of X in Y Percent concentration of substance X within another substance Y = ppm concentration divided by 10,000 Suppose we are given a parts per million measurement (ppm of X in Y) and we want to convert that to a percent concentration of X in Y. How to convert ppm concentration to percent concentration ACCURACY of PPM or % CONCENTRATIONS of GASES in AIR.CONVERSION TABLE ppm to / from % CONCENTRATION.FORMULA for ppm CONVERT to % CONCENTRATION.CONVERT PPM to % CONCENTRATION and vice versa.How to Convert Between Percent of a Gas in Air & Parts Per Million (ppm) of a Gas in Air Article Contents We also provide an ARTICLE INDEX for this topic, or you can try the page top or bottom SEARCH BOX as a quick way to find information you need.

This article describes the simple math used to convert between parts per million (PPM) and percentage, such as how we convert a measurement of 800 ppm of CO 2 in air (indicated on our colorimetric gas measurement tube shown at page top) and a percentage concentration of that same gas in air.

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