Grass Seed for 500 Square Feet

For a 500 sq ft overseeding, 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

How do you know the lawn size?

Lawn area (sq ft)

Lawn length (ft)

Lawn width (ft)

Lawn climate

Sun exposure

Project

Seed choice

Bag rate (lb/1,000 sq ft)

Seed bag size (lb)

Seed price per bag ($)

Starter fertilizer

Fertilizer coverage per bag (sq ft)

Fertilizer price per bag ($)

Seed cover

Coverage per bale/roll (sq ft)

Price per bale/roll ($)

Grass seed

0.8 lb

Lawn area

500 sq ft

Planning rate

1.5 lb / 1,000 sq ftExtension range: 1–2 lb; midpoint used

Seed needed

0.8 lbOverseeding · uncoated-seed planning quantity

25-lb bags to buy

1 bag25.0 lb purchased · 24.3 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

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What changes for 500 sq ft?

Overseeding uses the selected overseeding rate. Switching to new lawn changes the quantity because the project starts with an existing stand rather than bare soil.

Seeded grass	Climate fit	Overseeding quantity
Turf-type tall fescue	cool / transition	2.0–3.0 lb
Kentucky bluegrass	cool	0.50–1.0 lb
Perennial ryegrass	cool	1.5–2.5 lb
Fine fescue	cool	1.0–2.0 lb
Common bermudagrass (seeded)	transition / warm	0.50–1.0 lb
Centipedegrass	warm	0.13–0.25 lb
Zoysiagrass (seeded cultivar)	transition / warm	0.50–1.0 lb
Bahiagrass	warm	1.5–2.5 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 size	Bags	Approx. leftover
5 lb	1	4.3 lb
10 lb	1	9.3 lb
20 lb	1	19.3 lb
25 lb	1	24.3 lb
40 lb	1	39.3 lb
50 lb	1	49.3 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.