Grass Seed Coverage Calculator
Applying the right amount of grass seed is essential for successful lawn establishment. Too little seed results in thin, patchy turf that allows weeds to take hold. Too much seed causes competition between seedlings, leading to poor germination and wasted money. Seeding rates depend on the grass species and whether you are starting a new lawn or overseeding an existing one. New lawn seeding on bare soil requires the full rate, while overseeding into existing turf typically uses half the new-lawn rate to avoid competition. This calculator uses seeding rates consistent with state cooperative extension turfgrass guidelines. Kentucky bluegrass is seeded at 2 lb per 1,000 sq ft for new lawns, tall and fine fescue at 8 lb, Bermudagrass (hulled seed) at 2 lb, and perennial ryegrass at 10 lb. Timing matters as much as rate: cool-season grasses perform best when seeded in late summer to early fall; warm-season grasses are seeded in late spring. Always prepare the seedbed properly before seeding for best results.
Seeding rates by grass type
| Grass Type | New Lawn (lb/1,000 sq ft) | Overseeding (lb/1,000 sq ft) |
|---|---|---|
| Kentucky Bluegrass | 2 | 1 |
| Tall/Fine Fescue | 8 | 4 |
| Bermudagrass (hulled) | 2 | 1 |
| Perennial Ryegrass | 10 | 5 |
Seed needed (lb) = (Area / 1,000) x Seeding rate
Worked example
Area: 5,000 sq ft. Tall fescue, new lawn at 8 lb per 1,000 sq ft.
- Area factor = 5,000 / 1,000 = 5
- Seed needed = 5 x 8 = 40.00 lb
Frequently asked questions
How many pounds of grass seed do I need per 1,000 sq ft?
Seeding rates vary by grass species. Kentucky bluegrass requires 2 to 3 lb per 1,000 sq ft for new lawns. Tall fescue needs 6 to 8 lb. Bermudagrass (hulled) needs 1 to 2 lb. Perennial ryegrass needs 8 to 10 lb. Overseeding rates are generally half the new-lawn rate.
What is the difference between new lawn seeding and overseeding?
New lawn seeding is establishing grass on bare soil with no existing turf. Overseeding is spreading seed into an existing lawn to fill thin areas or improve density. New lawn seeding requires higher seed rates because there is no existing grass to fill gaps.
When is the best time to seed a lawn?
Cool-season grasses (bluegrass, fescue, ryegrass) are best seeded in late summer to early fall (late August to October) when soil temperatures are between 50 and 65 degrees Fahrenheit. Warm-season grasses (Bermuda) are best seeded in late spring to early summer when soil temperatures exceed 65 degrees Fahrenheit.
How deep should grass seed be planted?
Grass seed should be planted at a depth of 1/8 to 1/4 inch. Deeper planting reduces germination. Seed must make firm contact with soil; use a roller or press it gently into the seedbed. Keeping the seed moist until germination is critical.
What are the seeding rates from turfgrass extension sources?
The National Turfgrass Evaluation Program (NTEP) and state cooperative extension programs publish species-specific seeding rates. Common rates per 1,000 sq ft for new lawns: Kentucky bluegrass 2 lb, fine fescue 4 lb, tall fescue 8 lb, perennial ryegrass 10 lb, Bermudagrass hulled 2 lb. Overseeding uses half these rates.
Sources
- University of Minnesota Extension: Seeding a lawn.
- Purdue University Extension: Turfgrass Science seeding rate recommendations.
- National Turfgrass Evaluation Program (NTEP): ntep.org.
Reviewed by the CalculatorHub team, edited by James Graham, 14 June 2026. Rates may vary by cultivar and region. Consult your local extension service.