Lawn Fertilizer Calculator

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Calculate exactly how much fertilizer your lawn needs based on soil science.

1 Lawn Area

Please enter a valid lawn area greater than zero.

Please enter valid length and width values.

2 Fertilizer Analysis (N-P-K)

Enter the guaranteed analysis from your fertilizer bag.

N-P-K values must be between 0–100 and their sum cannot exceed 100%.

3 Target Nitrogen Rate

Please enter a valid target nitrogen rate greater than zero.

📋 Agronomy Reference: Standard lawn recommendations typically range from 0.5 to 1.0 lb of Nitrogen per 1,000 sq ft. Cool-season grasses often thrive at 0.75–1.0 lb, while warm-season grasses may prefer 0.5–0.75 lb per application.

📊 Results

Total Fertilizer Required —

🔬 Nutrient Breakdown (Total Applied)

Nitrogen (N) —
Phosphorus (P) —
Potassium (K) —
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