Free Ammonia Calculator
* Special thanks to Boomer from
for his help.
This calculator estimates the concentration of free, or unionized, ammonia (NH3) in an aquarium given the total ammonia (NH3 + NH4) concentration. See my
Nitrogen-Ion Conversion Chart
for an explanation of the difference between NH and NH-N, but the short of it is that you should use "NH-N" as your Total Ammonia Type if your test kit measures Total Ammonia Nitrogen (TAN).
Total Ammonia Type:
NH-N (NH3-N + NH4-N)
NH (NH3 + NH4)
Total Ammonia Measurement:
Relative Specific Gravity (sg)
NH3 + NH4 Concentration:
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