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which is a million (when speaking English). But when converting percent concentrations to parts per million we write:ġ00 x 10,000 = 1,000,000. If we have 100% or "all" of something expressed in parts per million, we should end up with exactly a million parts per million, right?ġ00% can also be written as 1. Let's try converting 100 percent of something to parts per million. You can always check your math by using 100% - as Shelly Weinberg (statistics & queuing theory instructor at IBM Systems Research Institute) said, "Are you scared of the math, pick a number, any number. Remember next that parts one part per million means 1 in a million, so we can writeįinally, remember that one percent concentration expressed in parts per million is therefore written asġ% of a million = 0.01 x 1,000,000 = 10,000 ppm Still nervous about converting between PPM and % concentration? Check your decimal point. Or writing that in decimal form (without the percent) we'd write 1% = 0.01 Remember that 1% means one part in 100 so we can write Where the heck is that 10,000 coming from in these conversion formulas or in the ppm % conversion table we give below? Now we're given a % concentration and we want to express that in parts per million or ppm.įormula to convert percent concentration into parts per million: This procedure is the opposite of what we just did above.
#HOW TO CALCULATE PPM GAS PRESSURE HOW TO#
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
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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