Fertilizer NPK calculator

Enter fertilizer N-P-K percentages, pick a nutrient, and set your desired rate and lawn area to see how much product you need.

Enter values to calculate fertilizer needed.

Verify percentages on the product label. Results are math helpers only—follow the label and local extension guidance for timing and rates.

Markdown mirror · llms.txt for AI agents. Results are estimates—verify labels and local guidance.