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Last updated: April 13, 2026

Water Soluble Fertilizer Calculator

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Table of contents

Mixing water-soluble fertilizer

Water-soluble fertilizers need precise mixing to achieve desired PPM (parts per million) of nitrogen. Too much burns plants; too little wastes potential. This calculator converts PPM targets to grams of fertilizer per gallon of water.

Grams/gallon = (PPM × 3.785) / (N% × 10)
Common: 100–300 ppm N.
ppm
First number of the N-P-K ratio.
%
gallons
3.79
g/gal
3.8
grams
0.8
teaspoons

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