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I looked this number up out of curiosity a while back because it seemed like nitrite would skyrocket from added ammonia, as well as the nitrate at the end of a fishless cycle. A number of different posters across different boards arrived at approximately the following answer based on molecular weights for each molecule:
1 ppm ammonia --> 2.7 ppm nitrite --> 3.6 ppm nitrate
1 ppm ammonia --> 2.7 ppm nitrite --> 3.6 ppm nitrate