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Calcimator

Fertigation Injection Rate Calculator

Injector ratio and PPM from stock solution and flow.

Inputs

%

Results

Stock concentration (ppm)

20,000

Injection rate (GPH)

30

Injection rate (mL/min)1,892.7
Product (oz/gal stock)1.34
Total water applied (gal)3,000
Total nutrient (lbs)5
Stock solution needed (gal)30
Total product used (oz)40.1
Total product used (lbs)2.5
Recommended tank size (gal)33
Oz Per (gal) Stock10
How to Use This Calculator
  1. Enter Target Nutrient (ppm) — the desired concentration in irrigation water (e.g., 200 ppm N).
  2. Set Injection Ratio (1:X) to match your injector model (common ratios: 100, 128, 200).
  3. Enter System Flow (GPM) and Irrigation Run Time (min).
  4. Set Product Nutrient (%) and Product Density (lbs/gal) from the fertilizer label.
  5. Read Injection Rate (GPH and mL/min), Stock Concentration (ppm), and Total Product Used (lbs) to configure your injector.
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