How much grass seed do I actually need? As a rule of thumb, plan on about 5–10 lbs of seed per 1,000 square feet for a new lawn, and about half that for overseeding. The exact amount depends on your grass type — use the calculator to get the precise figure for your lawn.
A new lawn needs roughly 5–10 lbs of grass seed per 1,000 sq ft; overseeding an existing lawn needs about half that (2–5 lbs). Tall fescue and ryegrass are sown heaviest (~10 lbs), Kentucky bluegrass ~4 lbs, and Bermuda ~2 lbs. The formula is area ÷ 1,000 × seeding rate — or use the calculator below for any lawn size, shape, or grass type.
Enter your lawn size
Seeding rates by seed type
Grass seed coverage varies by seed type — turfgrasses, clover, and creeping thyme are all sown at different rates. Each species has a recommended seeding rate based on its seed size and how aggressively it spreads. These are the standard rates the calculator uses, in pounds per 1,000 square feet:
| Seed type | New lawn | Overseeding |
|---|---|---|
| Eco / low-maintenance (Eartheasy) | ||
| Eco-Lawn / Low-Maintenance Mix | 5 lbs | 7–8 lbs |
| MicroLawn Grass + MicroClover Blend | 5 lbs | 5 lbs |
| MicroClover | 1–2 lbs | ~0.2 lb |
| White (Dutch) Clover | 1 lb | 0.5 lb |
| Creeping Thyme | Sold as coverage-based kits (250–10,000 sq ft) | |
| Cool-season | ||
| Kentucky Bluegrass | 4 lbs | 2 lbs |
| Tall Fescue | 10 lbs | 5 lbs |
| Fine Fescue | 5 lbs | 2.5 lbs |
| Creeping Red Fescue | 5 lbs | 2.5 lbs |
| Perennial Ryegrass | 10 lbs | 5 lbs |
| Sun & Shade Mix | 6 lbs | 3 lbs |
| Warm-season | ||
| Bermuda | 2 lbs | 1 lb |
| Zoysia | 2 lbs | 1 lb |
| Bahia | 10 lbs | 5 lbs |
| Buffalo | 3 lbs | 1.5 lbs |
| Centipede | 0.5 lb | 0.3 lb |
| St. Augustine | 2 lbs | 1 lb |
Rates are per 1,000 square feet. Eartheasy product rates are taken from their product pages — Eco-Lawn is sown heavier when overseeding, and creeping thyme is sold by coverage rather than weight. Premium coated or branded blends sometimes specify their own rate — always check the bag.
How to calculate how much grass seed you need
The math behind the calculator is simple:
Step 1 — Measure your lawn. Multiply length × width for a rectangle. For odd shapes, break the lawn into rectangles, circles, and triangles and add them up.
Step 2 — Find your seeding rate from the table above for your grass type and project.
Step 3 — Multiply. Divide your area by 1,000, then multiply by the rate.
How much grass seed per square foot?
Divide the per-1,000 rate by 1,000. Tall fescue at 10 lbs per 1,000 sq ft works out to about 0.01 lb (roughly 0.16 oz) per square foot for a new lawn. Because per-square-foot numbers are tiny and easy to misjudge, measure your whole lawn and let the calculator scale the rate for you.
How much grass seed per acre?
One acre is 43,560 sq ft, so multiply the per-1,000 rate by 43.56.
| Grass type | New lawn / acre | Overseeding / acre |
|---|---|---|
| Kentucky Bluegrass | ~175 lbs | ~87 lbs |
| Tall Fescue / Ryegrass | ~435 lbs | ~218 lbs |
| Fine Fescue | ~218 lbs | ~109 lbs |
| Bermuda | ~87 lbs | ~44 lbs |
Switch the calculator's area unit to acres to do this automatically.
Grass seed needed by lawn size
A quick reference for common lawn sizes, based on a typical all-purpose lawn (about 6 lbs of seed per 1,000 sq ft for a new lawn). For other grasses, scale the numbers using the seeding-rate table above — or just use the calculator.
| Lawn size | New lawn | Overseeding |
|---|---|---|
| 500 sq ft | 3 lbs | 1.5 lbs |
| 1,000 sq ft | 6 lbs | 3 lbs |
| 2,000 sq ft | 12 lbs | 6 lbs |
| 5,000 sq ft | 30 lbs | 15 lbs |
| 10,000 sq ft | 60 lbs | 30 lbs |
| ¼ acre (10,890 sq ft) | ~65 lbs | ~33 lbs |
| ½ acre (21,780 sq ft) | ~131 lbs | ~65 lbs |
| 1 acre (43,560 sq ft) | ~261 lbs | ~131 lbs |
New lawn vs. overseeding — why the rate is halved
A new lawn (bare soil) needs full coverage so seedlings fill in every inch — that's the higher rate. Overseeding drops seed into existing turf to thicken it or repair thin spots, so you only need about half as much. Using new-lawn rates to overseed wastes seed and makes seedlings compete; using overseeding rates on bare soil leaves thin, patchy results. Pick the right mode in the calculator and it adjusts the rate for you. The halving rule applies to conventional turfgrasses — specialty products set their own overseeding rates (Eco-Lawn, for example, calls for sowing heavier when overseeding), and the calculator follows each product's label.
How much does a bag of grass seed cover?
Coverage depends on the seeding rate, not just the bag weight:
A 50 lb bag of tall fescue at the new-lawn rate of 10 lbs/1,000 sq ft covers 5,000 sq ft. Used for overseeding (rate 5), the same bag covers 10,000 sq ft. Lighter-seeded grasses like Bermuda stretch much further — a 50 lb bag covers up to 25,000 sq ft on a new lawn.
| Bag size | New lawn coverage | Overseeding coverage |
|---|---|---|
| 3 lb bag | ~300 sq ft | ~600 sq ft |
| 7 lb bag | ~700 sq ft | ~1,400 sq ft |
| 10 lb bag | ~1,000 sq ft | ~2,000 sq ft |
| 20 lb bag | ~2,000 sq ft | ~4,000 sq ft |
| 50 lb bag | ~5,000 sq ft | ~10,000 sq ft |
Based on tall fescue (10 lbs/1,000 sq ft new, 5 overseeding). Lighter grasses like Bermuda or Kentucky bluegrass cover 2–5× more per bag.
How much does grass seed cost?
Grass seed runs roughly $3–$10 per pound depending on species and quality — basic contractor mixes sit at the low end, while premium, weed-free, and coated blends cost more. For a typical 5,000 sq ft new lawn (about 30–50 lbs of seed) that works out to roughly $150–$400 in seed. Overseeding the same lawn costs about half. Enter your price per pound in the calculator's More options to get a cost estimate for your exact lawn.
What changes how much grass seed you actually need
The calculator gives the agronomically correct baseline. Add a little extra when:
- Bare or compacted spots — heavy-traffic areas and patches with no existing grass need full new-lawn rates even when you're overseeding the rest.
- Slopes — seed washes downhill; sow about 15–20% heavier and mulch.
- Birds and runoff — open soil loses some seed; a light straw or seed-starting mulch protects it.
- Older seed — germination drops as seed ages. If your bag is past its tested date, bump the amount up.
- Spreader calibration — apply half the seed in one direction and half crosswise for even coverage instead of one heavy pass.
Avoid over-seeding: too much seed makes seedlings compete for water and nutrients, and the lawn comes in thin and weak — more is not better.
How to spread grass seed evenly
- Rake and level the soil so seed makes good contact — if you’re filling low spots, size the top-dressing with our soil calculator.
- Set your spreader to the rate on the bag (or half of it per pass).
- Apply in two directions — half north–south, half east–west.
- Rake lightly to settle seed 1/8–1/4 inch into the soil, then roll or tamp.
- Keep it moist until germination.
Frequently asked questions
How much grass seed do I need per 1,000 square feet?
5–10 lbs for a new lawn and 2–5 lbs for overseeding, depending on grass type. Tall fescue and ryegrass use ~10 lbs; Kentucky bluegrass ~4 lbs; Bermuda ~2 lbs (new-lawn rates).
How much grass seed do I need for overseeding?
About half the new-lawn rate — typically 2–5 lbs per 1,000 sq ft. Overseeding only fills in existing turf, so it needs far less seed than seeding bare soil.
How much grass seed per acre?
Multiply the per-1,000 rate by 43.56. A new tall-fescue lawn needs ~435 lbs/acre; Kentucky bluegrass ~175 lbs/acre.
How much does a 50 lb bag of grass seed cover?
At a 10 lbs/1,000 sq ft new-lawn rate, a 50 lb bag covers 5,000 sq ft. For overseeding (5 lbs/1,000), it covers 10,000 sq ft. Lighter grasses like Bermuda cover much more.
Can you put down too much grass seed?
Yes. Over-seeding makes seedlings compete for water, light, and nutrients, producing a thin, weak lawn. Stick to the recommended rate.
How much grass seed do I need for a 5,000 sq ft lawn?
About 30 lbs for a new lawn or 15 lbs for overseeding, using a typical all-purpose rate of 6 lbs per 1,000 sq ft. Heavier grasses like tall fescue need ~50 lbs new; lighter ones like Bermuda need ~10 lbs.
How much does grass seed cost?
Roughly $3–$10 per pound depending on type and quality. A typical 5,000 sq ft new lawn runs about $150–$400 in seed; overseeding costs about half.
How long does grass seed take to grow?
Most grasses germinate in 5–21 days depending on species, soil temperature, and moisture. Keep the seedbed consistently moist until seedlings establish.
Ready to seed your lawn?
Now that you know how much you need, get quality grass seed and lawn-care supplies from Eartheasy.
Shop the Natural Lawn Care collection →Related grass seed & lawn guides
More from the Eartheasy library on choosing your seed, sowing it at the right time, and keeping the lawn healthy once it's in.
Sod vs. Seed: The Best Choice for a Beautiful LawnWhich gets you a lawn faster, which actually costs less — worth settling before you buy a single bag.
Fall Is the Best Time to Plant Your Eco-LawnWhy late summer into fall beats spring for sowing, and how to time the window where you live.
How to Establish a Clover LawnSoil prep, sowing rate, and what to expect from a clover lawn through its first season.
How to Grow MicrocloverHow microclover blends into turf, feeds it nitrogen, and stays low between mowings.
How to Make Centipede Grass SpreadGetting slow-growing centipede to fill in — seeding, feeding, and the mistakes that stall it.
Natural Lawn Care GuideThe organic approach end to end: soil, seed, mowing height, and weeds without chemicals.
