Divide by 10000. For example - something with a concentration of 120ppm is 0.0012%
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Multiply ppm by 10000.
Divide ppm by 10,000:50,000 / 10,000 = 5 %
ppm=% X 10000 -DPS NOIDA
10 ppm = 10/1,000,000 =0.001/100 = 0.001%
10 ppm as a fraction is 10 / 1 000 000 = 0.00001, as a percentage = (10 / 1 000 000) * 100 = 0.001 %