PPB to PPM Converter
Convert a concentration in parts per billion to parts per million using the converter below.
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How to Convert PPB to PPM
Parts per billion (ppb) and parts per million (ppm) are measures of the concentration of a substance in a mixture or solution or mixture. They are similar measurements, but on a different scale:
- parts per billion (ppb): 1 part substance per 1,000,000,000 parts solution
- parts per million (ppm): 1 part substance per 1,000,000 parts solution
To convert a concentration in ppb to ppm, you need to know the conversion ratio between them to scale the measurement down. Then you can use the ppb to ppm formula to find the result.
Since one billion (109) is one thousand times larger than one million (106), the conversion ratio is 1,000 ppm/ppb.
PPB to PPM Formula
Therefore, the formula to convert ppb to ppm is:
ppb ÷ 1,000 = ppm
So, to convert a concentration in parts per billion to parts per million, divide the concentration in ppm by 1,000. Similarly, you can multiply a concentration in parts per million by 1,000 to convert ppm to ppb.
For example, let’s convert 5,500 ppb of a substance in a solution to parts per million. Substitute 5,500 ppb in the formula above to solve.
5,500 ppb ÷ 1,000 = 5.5 ppm
Thus, a concentration of 5,500 ppb is equivalent to 5.5 ppm.
You can use our ppm converter to convert other concentration measurements to parts per million as well.