Calculate exactly how much fertilizer your lawn or field needs based on nutrient targets.
Application Goals
Basis: lbs per 1,000 sq ft
Fertilizer Grade
Application Summary
Enter area and rate
About this calculator
Overview
Fertilizer labels (e.g., 10-10-10) represent the percentage by weight of Nitrogen (N), Phosphate (P₂O₅), and Potash (K₂O). The remainder is filler material for even spreading.
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Pro Tips
Lawn Health: Most lawns primarily need Nitrogen for green growth and density.
Soil Testing: Only apply Phosphorus if a soil test indicates a deficiency to prevent water runoff pollution.
Timing: Apply fertilizers when the grass is actively growing and soil moisture is adequate.
Uniformity: Use a calibrated spreader to ensure even distribution of nutrients.
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Fun Facts
"The 'N-P-K' numbers (like 10-10-10) are percentages by weight. A 50lb bag of 10-10-10 contains 5lbs of actual Nitrogen."
"Historically, crushed bones were used as fertilizer for their Phosphorous content."
