How much fertilizer for your lawn?
Turn a target nitrogen rate into pounds of product and bags for any N-P-K fertilizer and lawn size.
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Before you buy: The three numbers are the percent by weight of nitrogen (N), phosphate (P₂O₅) and potash (K₂O). A 15 lb bag of 24-0-6 holds 3.6 lb of nitrogen.
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Worked examples
| Fertilizer | Per 1,000 ft² (1 lb N) | 5,000 ft² lawn |
|---|---|---|
| 10-x-x | 10.00 lb | 50.0 lb |
| 16-x-x | 6.25 lb | 31.3 lb |
| 24-x-x | 4.17 lb | 20.8 lb |
| 29-x-x | 3.45 lb | 17.2 lb |
| 32-x-x | 3.13 lb | 15.6 lb |
Formula & assumptions
Product (lb) = target nitrogen ÷ (N% ÷ 100) × area ÷ 1,000. About 1 lb of actual nitrogen per 1,000 ft² per application is a common extension guideline; many recommend 0.5 lb or less for quick-release products or in summer heat. Check local rules: some states and cities restrict phosphorus or set application blackout dates.
FAQ
How much 10-10-10 per 1,000 square feet?
For 1 lb of nitrogen you need 10 lb of 10-10-10 per 1,000 ft².
Can I use the spreader setting on the bag?
Yes, if your spreader model is listed. This calculator tells you how much product should end up on the lawn, so you can check the setting by weighing what is left.
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