Last updated June 16, 2026 by our expert review team
Grass Seed Rates by Type
A new lawn needs about 7 lb of tall fescue seed per 1,000 sq ft — roughly 35 lb for an average 5,000 sq ft yard — and about half that to overseed. Fine-textured grasses like Kentucky bluegrass need far less (2–3 lb), while quick-cover ryegrass needs the most.
Rates are quoted per 1,000 square feet (grams per square meter in metric). Use the full rate on bare soil for a new lawn and about half to overseed an existing one.
| Grass type | New / 1,000 ft² | Overseed / 1,000 ft² |
|---|---|---|
| Tall Fescue | 7 lb | 3.50 lb |
| Kentucky Bluegrass | 2.50 lb | 1.25 lb |
| Perennial Ryegrass | 8 lb | 4.50 lb |
| Fine Fescue | 4.50 lb | 2.50 lb |
| Bermuda (seeded) | 1.50 lb | 1 lb |
| Zoysia | 1.50 lb | 1 lb |
Rates follow university turf extension guidance. Coverage is the area one unit of new-lawn seed covers. Always check the seed label for the supplier's rate.
Expert Contributors
Ruth Wairimu
Landscape Architect
Landscape architect with 9+ years of experience, AAK member, IFLA climate activist, and founder of Bloomwell.
See full profileHawkin
Certified Cost & Estimating Professional
AACE-certified estimator working with 20+ insulation companies including the two largest franchises in America.
See full profileUpdated June 2026
How we verify our calculatorsOverseeding rate
To overseed an existing lawn, use about half the new-lawn rate — roughly 3.5 lb of tall fescue per 1,000 sq ft (about 17 lb for a 5,000 sq ft lawn). Switch the calculator to Overseed for your exact amount.
When to plant
Sow cool-season grasses (fescue, bluegrass, ryegrass) in early fall (or early spring); sow warm-season grasses (bermuda, zoysia) in late spring once soil is reliably above 65°F. Right timing matters as much as the right rate.
Pick your grass
Which grass seed should you plant?
The seed-rate window (overseed → new lawn) and the honest tradeoff for each grass, in lb per 1,000 ft². Bars compare how much seed each needs at the same coverage.
Tall Fescue
germinates 7–14 days
Choose it if: You want one durable, drought- and traffic-tolerant lawn with low fuss.
Cool-season
Kentucky Bluegrass
germinates 14–21 days
Choose it if: You want the finest, self-repairing lawn and can wait through slow germination.
Cool-season
Perennial Ryegrass
germinates 5–10 days
Choose it if: You need fast cover, are overseeding, or want quick erosion control.
Cool-season
Fine Fescue
germinates 7–14 days
Choose it if: The yard is shady or you want the lowest water and fertilizer needs.
Cool-season
Bermuda (seeded)
germinates 10–21 days
Choose it if: You're in a hot, full-sun climate with heavy foot traffic.
Warm-season
Zoysia
germinates 14–21 days
Choose it if: You want a dense, wear-tolerant warm-season lawn and can wait for it to fill in.
Warm-season
Methodology
How the Grass Seed Calculator Works
The calculator finds your lawn area, then multiplies by the seeding rate for the chosen grass type. In imperial it works in pounds per 1,000 sq ft; in metric it converts to grams per square meter and reports kilograms. Overseeding uses about half the new-lawn rate because the existing turf already provides cover.
Timing matters as much as quantity. Sow cool-season grasses (fescue, bluegrass, ryegrass) in early fall or early spring; sow warm-season grasses (bermuda, zoysia) in late spring once soil is reliably warm. Rates here follow Penn State Extension guidance. Buy a little extra for edges and bare patches.
Formulas
Pounds = (area ÷ 1,000) × rate per 1,000 ft²
Overseed rate ≈ new-lawn rate ÷ 2
Bags = pounds ÷ bag size (round up)
Quick Reference
- Tall fescue (new)
- 7 lb / 1k ft²
- KBG (new)
- 2.5 lb / 1k ft²
- Ryegrass (new)
- 8 lb / 1k ft²
- Bermuda (new)
- 1.5 lb / 1k ft²
- Overseed
- ≈ half the new rate
Grass Seed Examples
Overseed a Tired Lawn
5,000 sq ft tall fescue, overseedOverseed in early fall for cool-season grass so seedlings establish before winter.
New Cool-Season Lawn
2,500 sq ft KBG, new lawnKentucky bluegrass is slow to germinate, so keep the seedbed moist for up to 3 weeks.
New Warm-Season Yard
4,000 sq ft bermuda, new lawnSow bermuda in late spring once soil is reliably above 65 to 70 degrees Fahrenheit.
Avoid these
Grass Seeding Mistakes
Doubling the seeding rate
More seed is not better. Crowded seedlings compete and thin out. Use the labeled rate.
Using the new-lawn rate to overseed
Overseeding needs about half the rate since the lawn already has cover.
Seeding in the wrong season
Cool-season grass goes down in fall; warm-season grass in late spring once soil is warm.
Skipping seed-to-soil contact
Rake lightly and keep the seedbed moist until germination, or the rate will not matter.
Grass Seed Calculator FAQs
How much grass seed do I need per square foot?
What is the difference between new lawn and overseeding rates?
How many pounds of seed for a 2,500 sq ft Kentucky bluegrass lawn?
Can I use too much grass seed?
When should I plant grass seed?
How long does grass seed take to germinate?
How do I get good seed-to-soil contact?
Do I need starter fertilizer when seeding?
How much does grass seed cost?
Should I use seed or sod?
Want an instant lawn instead? Compare with the sod calculator. Prepping the bed? Use the soil calculator or fill dirt calculator.
Important Disclaimer
These estimates are for planning purposes only. Actual costs vary by location, material availability, and project complexity. Always get at least 3 local quotes. This calculator does not replace professional advice.