Grass Seed Quantity Planner
Enter your lawn dimensions and explicitly select a catalog product to create a planning estimate. Verify the current package application rate, coverage, and bag size before acting; check price, seller, and availability separately.
Pro Tips for Seeding Success
Choose a buffer deliberately
A buffer can account for measured-area error and application loss, but no single percentage fits every project. Set it deliberately and verify the package rate.
Plan fertilizer separately
This planner does not calculate or recommend fertilizer. Follow soil-test results, the current fertilizer label, and applicable local nutrient guidance.
Seed-to-soil contact matters
The #1 reason seeds fail to germinate is poor soil contact. After spreading seed, lightly rake it into the top 1/4" of soil or use a lawn roller. Don't just throw seed on top of existing grass.
Water frequently, not heavily
Keep the seedbed consistently moist with light watering 2-3 times daily for the first 2-3 weeks. Heavy watering washes seeds away. Once seedlings are 2" tall, transition to deeper, less frequent watering.
How to Calculate Grass Seed Coverage
The amount of grass seed you need depends on three things: your lawn size, the type of grass, and whether you're starting a new lawn or overseeding an existing one. Different grass species have very different seeding rates — Kentucky Bluegrass seeds are tiny and need only 2-3 lbs per 1,000 sq ft, while tall fescue seeds are larger and need 6-8 lbs per 1,000 sq ft.
| Grass Type | New Lawn lbs / 1,000 sq ft | Overseeding lbs / 1,000 sq ft |
|---|---|---|
| Kentucky Bluegrass | 2-3 | 1-2 |
| Tall Fescue | 6-8 | 3-4 |
| Perennial Ryegrass | 8-10 | 3-5 |
| Fine Fescue | 4-5 | 3 |
| Bermudagrass | 2-3 | 1-2 |
| Zoysia | 2-3 | 1-2 |
| Centipede | 0.25-0.5 | 0.125-0.25 |
| Bahiagrass | 8-10 | 5 |
The Simple Formula
Seed needed (lbs) = (Lawn area in sq ft / 1,000) x Seeding rate per 1,000 sq ft
For example, if you have a 5,000 sq ft lawn and you're planting tall fescue (seeding rate: 7 lbs per 1,000 sq ft), you'd need: 5,000 / 1,000 x 7 = 35 lbs of seed.
The planner applies the selected product's stored catalog rate and weight to your measured area and chosen buffer. Treat the result as a planning estimate, not a purchase instruction: verify the current package application rate, coverage, and bag size, then check price, seller, and availability separately.