Fertilizer Needed
50.0 lbs
Bags
1
Cost
$25
Coverage/Bag
5,000 sq ft
Current ratio: 10-10-10
Typical range: 0.5 - 1.5 lbs N per 1,000 sq ft per application
Fertilizer: 50.0 lbs
1 bag of 50 lb
1
50 lb bags
5,000
sq ft
$25
total
10-10-10
Each bag covers ~5,000 sq ft at your rate
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Inputs
Result
(5,000/1,000) × 1.0 / 0.10 = 50 lbs of 10-10-10 fertilizer. One 50 lb bag provides even nutrient coverage.
Inputs
Result
(8,000/1,000) × 1.0 / 0.32 = 25 lbs. Higher nitrogen percentage means less product needed.
The amount depends on your lawn area, fertilizer N-P-K ratio, and desired nitrogen rate. For example, a 5,000 sq ft lawn using 10-10-10 fertilizer at 1 lb N per 1,000 sq ft needs 50 lbs of fertilizer (one 50 lb bag). Higher nitrogen percentages mean less product needed per application.
N-P-K stands for Nitrogen-Phosphorus-Potassium, the three primary plant nutrients. A 10-10-10 fertilizer is 10% nitrogen, 10% phosphorus, and 10% potassium by weight. Nitrogen promotes leaf growth, phosphorus supports root development, and potassium improves overall plant health and disease resistance.
Apply 0.5 to 1.0 lb of nitrogen per 1,000 sq ft per application. Never exceed 1.5 lbs per 1,000 sq ft in a single application to avoid burning. Cool-season grasses typically need 2-4 lbs total nitrogen per year, split into 3-4 applications. Warm-season grasses need 2-6 lbs total per year.
| Grass Type | Annual N (lbs/1,000 ft²) | Applications/Year | Per Application |
|---|---|---|---|
| Kentucky Bluegrass | 3–4 lbs | 3–4 | 0.75–1.0 lb |
| Tall Fescue | 2–3 lbs | 2–3 | 0.75–1.0 lb |
| Bermudagrass | 4–6 lbs | 4–6 | 0.5–1.0 lb |
| Zoysiagrass | 2–4 lbs | 3–4 | 0.5–1.0 lb |
Cool-season grasses (fescue, bluegrass, ryegrass): fertilize primarily in fall (September-November) with a lighter spring application. Warm-season grasses (Bermuda, Zoysia, St. Augustine): fertilize in late spring through summer (May-August). Avoid fertilizing during extreme heat or drought.
For established lawns, use a high-nitrogen ratio like 20-5-10 or 32-0-4. For new lawns or overseeding, use a balanced starter fertilizer like 10-10-10 or 16-4-8. For fall winterizing, use a potassium-heavy ratio like 15-0-15. Soil tests can identify specific nutrient deficiencies.
| Purpose | Recommended N-P-K | When to Apply |
|---|---|---|
| Established lawn maintenance | 32-0-4 or 20-5-10 | Spring/Fall |
| New lawn / overseeding | 10-10-10 or 16-4-8 | At seeding time |
| Fall winterizer | 15-0-15 or 22-0-14 | October–November |
| Weed & feed combo | 28-0-3 or 25-5-5 | Mid-spring |
Yes. Over-fertilizing causes fertilizer burn (brown, crispy grass), promotes thatch buildup, increases disease susceptibility, and contributes to water pollution through runoff. Always follow recommended application rates and water lightly after applying to help nutrients reach the soil.
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Last Updated: Mar 26, 2026
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