A pound of nitrogen per thousand square feet is the agronomy; 26-0-3 on 12,000 square feet is the shopping trip. This converts one into the other.
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The bag's three numbers are percentages, not pounds. Enter lawn size, the analysis and your target rate, and get product pounds and bag count — no napkin division in the store aisle.
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<iframe src="https://getcrewplate.com/embed?trade=grounds&tool=fert" width="100%" height="1150" style="border:1px solid #CBD5E1;border-radius:10px" loading="lazy" title="Fertilizer math"></iframe> <p style="font:12px/1.5 system-ui;color:#64748B;margin:6px 0 0">Calculator by <a href="https://getcrewplate.com/free-tools">Crewplate</a> — 26 free trade calculators</p>