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The short answer: it depends on species and on whether you are seeding bare soil or thickening an existing lawn. As a working rule, a 20 lb bag covers about 2,000 to 3,300 sq ft as a new lawn and 4,000 to 5,000 sq ft overseeding for tall fescue or a typical retail blend. The same 20 lb of Kentucky bluegrass covers far more — around 7,000 to 10,000 sq ft new — because its seed is roughly ten times smaller. The big number printed on the front of the bag is nearly always the overseeding figure.
That distinction is where most of the confusion comes from. We do not test seed products first-hand; our picks come from aggregated owner reviews and expert consensus, described in how we rank, with the ranked field in best grass seed.
Coverage by bag size
Using a mid-range blend rate of 6 lb per 1,000 sq ft new — the same figure NC State Extension's turf handbook lists for tall fescue — and 3 lb per 1,000 sq ft overseeding, which matches most retail sun-and-shade mixes:
| Bag size | New lawn | Overseeding |
|---|---|---|
| 3 lb | 500 sq ft | 1,000 sq ft |
| 7 lb | 1,150 sq ft | 2,300 sq ft |
| 10 lb | 1,650 sq ft | 3,300 sq ft |
| 20 lb | 3,300 sq ft | 6,600 sq ft |
| 25 lb | 4,150 sq ft | 8,300 sq ft |
| 50 lb | 8,300 sq ft | 16,600 sq ft |
Coverage of a 20 lb bag by species
Seed size varies by an order of magnitude across common lawn grasses, and the seeding rate tracks it directly, following the same per-1,000-sq-ft convention NC State Extension uses in its own seeding-rate tables. Kentucky bluegrass runs around 2.2 million seeds per pound; tall fescue about 227,000.
| Species | Rate, new (lb/1,000 sq ft) | 20 lb covers, new | 20 lb covers, overseeding |
|---|---|---|---|
| Kentucky bluegrass | 2 – 3 | 6,700 – 10,000 sq ft | 10,000 – 20,000 sq ft |
| Perennial ryegrass | 6 – 9 | 2,200 – 3,300 sq ft | 3,300 – 5,000 sq ft |
| Tall fescue | 6 – 10 | 2,000 – 3,300 sq ft | 3,300 – 5,000 sq ft |
| Fine fescue | 4 – 5 | 4,000 – 5,000 sq ft | 6,700 – 10,000 sq ft |
| Bermudagrass (hulled) | 1 – 2 | 10,000 – 20,000 sq ft | 20,000 – 40,000 sq ft |
| Zoysia | 1 – 2 | 10,000 – 20,000 sq ft | 20,000 – 40,000 sq ft |
| Centipede | 0.25 – 0.5 | 40,000 – 80,000 sq ft | 80,000 sq ft plus |
Two adjustments before you trust these. First, check the label tag for germination and purity — a bag at 85 percent germination and 95 percent purity delivers 0.81 lb of live seed per pound, so real coverage is about 20 percent below the nominal figure. Second, if the product is a coated or mulch blend, a large share of the weight is not seed at all, and the manufacturer's own coverage figure already reflects that. Follow their number for those products, not the species rate.
What that works out to in 2026 dollars
| Product type | Typical price | Cost per 1,000 sq ft, new lawn |
|---|---|---|
| Consumer sun-and-shade blend, 20 lb | $55 – $110 | $17 – $33 |
| Premium turf-type tall fescue, 50 lb | $150 – $260 | $18 – $47 |
| Kentucky bluegrass, 25 lb | $100 – $180 | $8 – $22 |
| Coated patch-and-repair product, 10 lb | $25 – $45 | $60 – $120 |
| Hulled bermudagrass, 5 lb | $35 – $60 | $7 – $24 |
Prices are 2026 US retail and move with the seed harvest, so they swing year to year more than most garden goods. Farm supply stores, co-ops and turf distributors typically undercut big-box retail by 30 to 50 percent per pound on the same species, and they will tell you the variety, which consumer bags often will not.
Buy for the smaller number
The practical rule: measure your actual turf area, subtract driveways and beds, then buy against the new lawn figure on the back panel rather than the headline on the front, and add 15 to 20 percent. Running out with a fifth of the yard left is worse than a little leftover seed, because a second pass a week later germinates a week later and you can see the line for a full season.
Leftover seed keeps two to three years if it is stored cool, dry and sealed against rodents. Germination drops a few points a year, so bump the rate slightly rather than discarding it — the detail is in does grass seed go bad.
To size a job properly, start from how much grass seed per square foot or the worked example in how much grass seed for 1,000 square feet. Then get the timing right with the best time of year to plant grass seed, and see the full routine at the lawn care hub.