10,000/1,000,000 = 0.01 = 1%
Even easier:
-- To convert any number to percent, multiply it by 100.
-- 10,000 times 100 = 1 million
-- 1 million per 1 million = 1 percent
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Multiply ppm by 10000.
Divide ppm by 10,000:50,000 / 10,000 = 5 %
Divide by 10000. For example - something with a concentration of 120ppm is 0.0012%
100 into a percent = 10000%100 * 100% = 10000%
ppm means parts per million; percent basically means parts per hundred. Therefore, to convert from ppm to percent you should divide by 10,000.