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Grass Seed Calculator

Pick your grass type and project. We’ll calculate how many pounds of seed to buy, using typical recommended seeding rates.

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    Estimates only. Material densities and coverage vary by product and moisture, so confirm with your supplier before ordering.

    Typical grass seeding rates

    Seeding rates are given in pounds per 1,000 square feet. The figures below are common ranges from university extension guides – always check the label on your bag, because seed blends and coated seed can differ.

    Grass typeNew lawnOverseeding
    Tall fescue6–8 lb3–5 lb
    Kentucky bluegrass2–3 lb1–2 lb
    Perennial ryegrass6–9 lb3–5 lb
    Fine fescue4–5 lb2–3 lb
    Bermudagrass (hulled)1–2 lb0.5–1 lb
    Zoysiagrass1–2 lb0.5–1 lb
    Centipedegrass0.25–0.5 lb0.25 lb
    Bahiagrass7–10 lb4–5 lb

    When to plant grass seed

    Cool-season grasses (fescue, bluegrass, ryegrass) do best when seeded in early fall, with spring as a second choice. Warm-season grasses (Bermuda, zoysia, centipede, bahia) should be seeded in late spring to early summer, once soil temperatures stay above about 65 °F.

    Don’t over-seed

    More seed is not always better. Seeding far above the recommended rate makes seedlings compete for light and water, which leads to a thin, weak lawn. Spread half the seed in one direction and the other half at a right angle for even coverage.