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Grass Seed for 4,000 Square Feet

For a 4,000 sq ft new lawn, the amount to buy depends on climate, sun, species, seed coating, and the label rate—not one universal number. The prefilled calculator starts with Kentucky bluegrass and can be changed below.

01 / YOUR MEASUREMENTSUpdate any value
Grass seed
10.0 lb
Lawn area
4,000 sq ft
Planning rate
2.5 lb / 1,000 sq ftExtension range: 2–3 lb; midpoint used
Seed needed
10.0 lbNew lawn · uncoated-seed planning quantity
25-lb bags to buy
1 bag25.0 lb purchased · 15.0 lb left over
Optional starter fertilizer
Not included
Optional seed cover
Not included
Estimated material cost
Add product pricesSeed plus selected optional products
Recommended planning option

Kentucky bluegrass

Dense, cold-tolerant turf for sunny cool-season lawns; slower to establish.

The calculator uses the midpoint of the cited Extension range. Use your bag’s rate for coated seed, mixtures, or a product-specific rate.

Alternates worth comparing

Turf-type tall fescue: Durable and adaptable; a strong transition-zone and partial-shade choice.

Perennial ryegrass: Fast germination and good wear tolerance; often used in cool-season mixtures.

Planting window

Cool-season planning: late summer through early fall is usually the best establishment window; spring is the second choice. Confirm dates with your local Extension office.

Not sold as seed

St. Augustinegrass and hybrid bermudagrass are sod, plug, or sprig choices. They are excluded from seed math. Compare with the Sod Calculator →

Planning estimate. Adjust allowances and sample prices for your supplier; tax, delivery, and labor are not included.

BEYOND THE MATERIALS

Make it a complete project

Check the steps, tools, and DIY difficulty before you shop. Your calculator results can be added to My Projects above.

How to Plant a New Lawn (Sod or Seed) →
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Check for a contractor serving your project location. Your calculator stays free wherever you live.

Optional. Your ZIP stays in this tab and is not sent to analytics. Availability is based on approximate ZIP locations; confirm your address with the contractor.

What changes for 4,000 sq ft?

New lawn uses the selected establishment rate. Switching to overseeding changes the quantity because the project starts with bare soil rather than existing turf.

Seeded grassClimate fitNew lawn quantity
Turf-type tall fescuecool / transition24.0–32.0 lb
Kentucky bluegrasscool8.0–12.0 lb
Perennial ryegrasscool16.0–20.0 lb
Fine fescuecool16.0–20.0 lb
Common bermudagrass (seeded)transition / warm4.0–8.0 lb
Centipedegrasswarm1.0–2.0 lb
Zoysiagrass (seeded cultivar)transition / warm4.0–8.0 lb
Bahiagrasswarm20.0–40.0 lb

These are uncoated-seed planning ranges. Product labels control. St. Augustine and hybrid bermudagrass are excluded because they are established vegetatively.

Common bag-size choices

Bag sizeBagsApprox. leftover
5 lb20.0 lb
10 lb10.0 lb
20 lb110.0 lb
25 lb115.0 lb
40 lb130.0 lb
50 lb140.0 lb

At this size, smaller bags can reduce leftovers, but compare price per pound and make sure every bag is the same cultivar or mixture.

Seed may fit when…

You can prepare the soil, keep the surface moist through germination, and wait for establishment.

Sod may fit when…

You need faster cover, are dealing with erosion, or want a grass that is not commonly established from seed. Run the sod quantity →

Included: seed plus any optional label-based fertilizer and cover products selected above. Not included: soil-test recommendations, herbicides, irrigation parts, grading, topsoil, delivery, or labor.

For contractors: take the next step with Job Ready IQ.
Explore estimating tools for your business from the team behind Honey-Do Squad.
Explore Job Ready IQ →

Want the full guide — tools, step-by-step, common mistakes and FAQ? See the Grass Seed Calculator.

Other sizes

500 sq ft (new lawn)500 sq ft (overseeding)1,000 sq ft (new lawn)1,000 sq ft (overseeding)1,500 sq ft (new lawn)1,500 sq ft (overseeding)2,000 sq ft (new lawn)2,000 sq ft (overseeding)2,500 sq ft (new lawn)2,500 sq ft (overseeding)