Fertigation Calculator

Calculate fertilizer injection rates, stock solution concentration, and nutrient ppm for fertigation systems.

System flow (GPM)

Target rate (lb N/acre)

Field area (acres)

Nutrient content (%)

Injection ratio (%)

Irrigation run time (min)

Product density (lb/gal)

Tab to move between fields

Product needed (lbs)

217.4

Target concentration (ppm)

1,997.1

Product needed (gal)20.02

Stock injection rate (GPH)30

Product rate (GPH)10.01

Stock concentration (lb/gal)3.62

Est. EC increase (mS/cm)2.85

How to Use This Calculator

Enter your irrigation system flow rate in GPM and field area in acres.
Set the target nutrient application rate in lbs per acre (e.g., lbs of nitrogen).
Enter fertilizer nutrient content percentage (e.g., urea = 46% N) and product density in lb/gal.
Set the injector ratio (%) and total irrigation run time in minutes.
Read Product needed (gallons), Target concentration (ppm), and Injection rate (GPH) to configure your injector.

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