Biology

Water Soluble Fertilizer Calculator

Find fertilizer grams for a target ppm in water.

Calculated Output

Fertilizer needed 2.839

Formula: grams = ppm × liters ÷ 1000 ÷ (N%/100)

Step-by-Step Breakdown

1. Values used:

2. Target N = 150 ppm

3. Fertilizer N = 20 %

4. Water volume = 1

6. Fertilizer needed = 2.839

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The math behind it

ppm = mg/L. grams = ppm × liters ÷ 1000, divided by the fertilizer's N fraction.

150 ppm N in 1 gal with 20-N fertilizer → ~2.84 g.

EC/PPM meters?

Use one to verify your mixed solution's strength.