Lawn Fertilizer Calculator
The pounds of product come from the nitrogen you choose and the percent on your bag. A yearly total by grass type is not verified, so it is not shown.
Result: product
Enter an area greater than 0.
Follow the product label.
How Much Fertilizer Do You Need?
Pounds of product per 1,000 square feet = nitrogen pounds ÷ (nitrogen percent ÷ 100)
Sample bag, not a product we name: 1 pound of nitrogen and a bag that is 20 percent nitrogen means 5 pounds of product per 1,000 square feet. For 5,000 square feet that sample is 25 pounds. Twenty percent is a sample analysis you would read off a bag.
For a quick-release nitrogen product, keep a single application to 1 pound of nitrogen per 1,000 square feet. Rutgers NJAES FS839.
K-State Research and Extension lists 1 to 1.5 pounds of nitrogen per 1,000 square feet for cool-season grasses in fall. K-State Research and Extension.
A full-year nitrogen total that changes with the grass is not verified. Check the box only when the product is quick-release. If the nitrogen you typed is over 1 pound, the result says so.
Product Pounds at the 1 Pound Nitrogen Cap
Each row is 1 pound of nitrogen per 1,000 square feet, which is the quick-release cap, applied to 1,000 square feet. The percent is a sample bag analysis.
| Nitrogen on the bag | Product per 1,000 sq ft |
|---|---|
| 10 percent | 10 lb |
| 20 percent | 5 lb |
| 46 percent | 2.2 lb |
Common Mistakes With the Lawn Fertilizer Calculator
- Dividing by the percent instead of the fraction. 20 percent is 0.20, and 1 divided by 0.20 is 5.
- Stacking a second quick-release application on the same visit. The cap is per application.
- Looking up a yearly total by grass. That total is not verified here.
Seed and Soil Pages
Lawn Fertilizer Calculator FAQ
How many pounds of product supply 1 pound of nitrogen at 20 percent nitrogen?
5 pounds of product per 1,000 square feet. Method: Rutgers NJAES FS839. Follow the product label.
What is the single-application limit for quick-release nitrogen?
1 pound of nitrogen per 1,000 square feet. Rutgers NJAES FS839. Follow the product label.
What fall nitrogen rate does K-State list for cool-season grass?
1 to 1.5 pounds of nitrogen per 1,000 square feet. K-State Research and Extension. Follow the product label.
Is a yearly nitrogen total by grass type listed?
No. That total is not verified. Follow the product label.