Chemigation Calculator

Calculate fertigation and chemigation injection pump rates, product volumes, and costs for applying chemicals through irrigation systems.

System flow rate (GPM)

Field size (acres)

Target rate (lb nutrient/acre)

Product concentration (%)

Product density (lb/gal)

Irrigation run time (hr)

Start delay (%)

End flush (%)

Product cost ($/gal)

Tab to move between fields

Product volume (gal)

1,059.6

Injection rate (GPH)

110.37

Total nutrient needed (lb)3,750

Total product needed (lb)11,718.8

Injection window (hr)9.6

Injection rate (mL/min)6,963.3

Dilution ratio (water:product)544

Concentration in water (ppm)780.6

Product per acre (gal/acre)8.48

Total product cost ($)$9,006.27

Cost per acre ($)$72.05

Water applied (in)0.17

How to Use This Calculator

Enter System flow rate (GPM), Field size (acres), and Target rate (lb nutrient/acre).
Set Product concentration (%), Product density (lb/gal), and Irrigation run time (hr).
Adjust Start delay (%), End flush (%) as needed.
Review Product volume (gal) and Injection rate (GPH).
Use Total nutrient needed (lb) and Total product needed (lb) to inform your decision.

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