Lawn Fertilizer Calculator
Calculate the amount of fertilizer to apply to your lawn based on area, desired nitrogen rate, and fertilizer analysis.
Fertilizer Needed
20.8 lbs
Fertilizer Needed vs Desired Nitrogen Rate
公式
## Calculating Lawn Fertilizer Fertilizer application is based on the nitrogen (N) rate per 1,000 square feet and the N percentage in your fertilizer product. ### Formula **Nitrogen Needed (lbs) = Lawn Area / 1000 x Desired N Rate** **Fertilizer (lbs) = Nitrogen Needed / (N% / 100)** Most cool-season lawns need 2-4 lbs of N per 1,000 sq ft per year, applied in 3-4 applications. Warm-season grasses need 1-3 lbs per year.
计算示例
A 5,000 sq ft lawn, 1 lb N/1000 sq ft, using 24-8-16 fertilizer.
- 01Nitrogen needed = 5,000 / 1,000 x 1 = 5 lbs N
- 02Fertilizer needed = 5 / 0.24 = 20.8 lbs of 24-8-16
- 03Per 1,000 sq ft = 1 / 0.24 = 4.2 lbs
常见问题
What do the three numbers on fertilizer mean?
They represent the percentage by weight of Nitrogen (N), Phosphorus (P), and Potassium (K). A 24-8-16 bag is 24% nitrogen, 8% phosphorus, 16% potassium.
When should I fertilize?
Cool-season grasses: primarily in fall, with lighter spring feeding. Warm-season grasses: late spring through summer when actively growing.
Can I over-fertilize?
Yes. Too much nitrogen burns grass, pollutes waterways, and promotes disease. Always follow recommended rates and use a calibrated spreader.
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