A Free Tool · New Lawns & Overseeding · Per 1,000 Sq Ft
How much grass seed do you actually need?
Enter your lawn size and grass type and get the pounds of seed to buy — whether
you're starting a new lawn from bare ground or overseeding to thicken an existing one.
The numbers use typical university turf-extension seeding rates (tall fescue runs about
8 lb per 1,000 sq ft for a new lawn), and overseeding uses half the new-lawn rate.
Pounds of seed needed·Six common grass types·New lawn or overseeding
Read this first
These are estimates based on typical seeding rates, not a substitute for your own
measurements or your seed bag's label. Rates vary by seed brand, variety, and how clean
the seed is, so always check the pounds-per-1,000-sq-ft figure printed on the bag you buy.
Getting your lawn area right matters most — the seed amount scales directly with it.
For best results, match your grass type to your region and seed in the right season.
Enter your lawn area (measure length × width in feet, or type the square footage if you know it), pick your grass type, and choose new lawn or overseeding. You'll get the pounds of seed to buy, with the seeding rate shown.
For an L-shaped or irregular lawn, split it into rectangles and add them up.
Enter total square footage if you've already measured or mapped it.
Tall fescue, bluegrass, ryegrass & fine fescue are cool-season; Bermuda & zoysia are warm-season.
Overseeding uses half the new-lawn rate.
Lawn area
Grass type
Seeding rate
Seed needed
The math, honestly
How the seed amount is figured
It's straightforward multiplication. First, get your lawn area in square
feet — length times width, or the figure you measured. Seeding rates are
published per 1,000 square feet, so divide the area by 1,000:
area_1000s = area_sqft ÷ 1000. A 5,000 sq ft lawn is 5 of those
units.
Then pick the rate for your grass. For a new lawn on
bare ground you use the full rate; for overseeding existing turf you
use about half of it, because the established grass is already covering
most of the ground. The pounds of seed are
seed_lbs = area_1000s × rate. So 5,000 sq ft of tall fescue at
8 lb per 1,000 sq ft is 5 × 8 = 40 pounds for a new
lawn, or 5 × 4 = 20 pounds to overseed.
Why rates differ by grass: seed size and growth habit vary widely.
Kentucky bluegrass seed is tiny and the plant spreads on its own, so it needs only
about 2.5 lb per 1,000 sq ft, while large-seeded, non-spreading tall fescue needs about
8. The calculator carries one rate per grass type and halves it automatically for
overseeding, so the tool and the reference table below always agree.
Seeding rates by grass type
The seeding rates the calculator uses, in pounds per 1,000 square feet. The new-lawn
column is for bare ground; the overseeding column is half of it, for thickening existing
turf. These are typical university turf-extension figures — always confirm against
the rate printed on your seed bag.
Grass type
New lawnlb per 1,000 sq ft
Overseedinghalf the new-lawn rate
Tall Fescuecool-season
8
4
Perennial Ryegrasscool-season
7
3.5
Fine Fescuecool-season
4.5
2.25
Kentucky Bluegrasscool-season
2.5
1.25
Zoysiawarm-season
2
1
Bermuda (seeded)warm-season
1.5
0.75
Rates are typical mid-range figures; published ranges vary a little by source, variety,
and seed purity. Cool-season grasses are best seeded in early fall; warm-season grasses
in late spring through early summer. Overseeding rates are exactly half the new-lawn rate.
Worked examples
A few lawns worked through with the same formula, so these match what the calculator
gives you. Pounds of seed are the area in thousands of square feet times the seeding rate.
Lawn & grass
Job
Ratelb / 1,000 sq ft
Seed neededpounds
5,000 sq ft · Tall Fescue
New lawn
8
40.0
5,000 sq ft · Tall Fescue
Overseeding
4
20.0
5,000 sq ft · Kentucky Bluegrass
New lawn
2.5
12.5
10,000 sq ft · Perennial Ryegrass
New lawn
7
70.0
2,000 sq ft · Fine Fescue
Overseeding
2.25
4.5
The first two rows are the reference cases the calculator is built to reproduce exactly:
5,000 sq ft of tall fescue is 40.0 lb for a new lawn and 20.0 lb to overseed. Enter your
own numbers above for any lawn size and grass type.
Reading the result well
A pound figure is only useful if you act on it sensibly. Four things worth knowing before
you buy and spread.
Measure the area carefully
The seed amount scales directly with lawn area, so an error here is the most expensive mistake you can make. Measure length and width in feet and multiply; for an L-shaped or curved lawn, break it into rectangles, find each area, and add them. Subtract large beds, the driveway, and the house footprint — you don't seed those. A rough pace-counted estimate is fine for a quick number, but tape-measure it before buying for a big job.
Match the grass to your region and season
Cool-season grasses — tall fescue, Kentucky bluegrass, perennial ryegrass, and fine fescue — do best in the north and are seeded in early fall, with late spring as a backup. Warm-season grasses like Bermuda and zoysia suit the south and are seeded in late spring through early summer. Seeding the wrong grass for your climate, or the right grass in the wrong season, wastes seed no matter how precise the weight is.
New lawn versus overseeding is not the same rate
Starting bare ground takes the full rate because every bit of soil needs to be covered. Overseeding into existing turf takes about half, because the established grass already holds most of the ground and you're just thickening it. Using the new-lawn rate to overseed crowds the seedlings and wastes seed; using the overseeding rate on bare ground leaves thin, patchy spots. Pick the right job in the calculator and the rate follows.
Seed-to-soil contact and water decide the outcome
The rate tells you how much seed to buy; getting it to grow is a separate job. Rake bare soil so seed sits in contact with it, lightly cover the seed about a quarter inch, and core-aerate before overseeding so seed reaches soil instead of resting on thatch. Then keep the top inch of soil moist until germination. Good contact and steady moisture let you hit a thick stand at the standard rate, rather than over-buying to compensate for poor establishment.
Where to buy
Got your numbers? Here's where to pick up what you need:
The terms behind the calculator, in plain English. These are background definitions, not
a substitute for local extension advice — check the rate on your seed bag and your
regional planting calendar for the real thing.
Seeding rate
How much seed to apply per unit of area, given here in pounds per 1,000 square feet. The rate depends on the grass, because seed size and growth habit differ. The whole calculation is this rate times your area in thousands of square feet.
New lawn (establishment)
Seeding bare or freshly prepared ground from scratch. It uses the full seeding rate because the entire surface needs coverage. New lawns also need careful soil prep, light seed cover, and consistent moisture until the grass is up.
Overseeding
Spreading seed into an existing lawn to thicken it or repair thin areas. It uses about half the new-lawn rate because the established turf already covers most of the ground. Aerating first helps the seed reach soil rather than resting on top of thatch.
Cool-season grass
Grasses that grow most in spring and fall and suit cooler, northern climates — tall fescue, Kentucky bluegrass, perennial ryegrass, and fine fescue. They're best seeded in early fall, when warm soil and cool air favor germination.
Warm-season grass
Grasses that grow most in the heat of summer and suit southern climates — here, seeded Bermuda and zoysia. They're best seeded in late spring through early summer, once the soil is reliably warm.
Seed-to-soil contact
How well the seed touches actual soil rather than sitting on thatch, debris, or hard ground. Good contact — from raking, light covering, and aeration — is the single biggest driver of how much of your seed actually germinates, independent of the rate.
Thatch
The layer of dead stems and roots between the green grass and the soil. A thick thatch layer blocks seed-to-soil contact, which is why core-aeration or light raking before overseeding makes such a difference to results.
Germination
The sprouting of seed into seedlings. It depends on moisture, soil temperature, and seed quality — not on the seeding rate. Keeping the top inch of soil consistently moist for the first few weeks is what turns the seed you bought into a stand of grass.
Frequently asked
It depends on the grass, because seeding rates are set per 1,000 square feet, not per single square foot. For a new lawn, tall fescue runs about 8 lb per 1,000 sq ft (0.008 lb per sq ft), Kentucky bluegrass about 2.5 lb, perennial ryegrass about 7 lb, and fine fescue about 4.5 lb. To get pounds for your lawn, multiply the per-1,000 rate by your area divided by 1,000. These are typical turf-extension rates; confirm against the rate on your seed bag. Try it in the calculator.
About half the new-lawn rate. Overseeding adds seed to turf that already exists to thicken it, so you need roughly half of what you'd use to start bare ground. Tall fescue drops from about 8 lb per 1,000 sq ft to about 4 lb, Kentucky bluegrass from 2.5 to about 1.25 lb, and perennial ryegrass from 7 to about 3.5 lb. The calculator applies the half rate automatically when you choose the overseeding option.
For cool-season grasses — Kentucky bluegrass, tall fescue, perennial ryegrass, and fine fescue — early fall is best, with late spring as a second choice; cool nights and warm soil let the seed establish before winter. For warm-season grasses like Bermuda and zoysia, late spring through early summer is best, once soil temperatures are reliably warm. Knowing your grass type tells you both the seeding rate and the right season.
For a new lawn, multiply 5 (which is 5,000 ÷ 1,000) by the grass type's rate. Tall fescue at 8 lb per 1,000 sq ft is 5 × 8 = 40 pounds. Kentucky bluegrass at 2.5 is 12.5 pounds, perennial ryegrass at 7 is 35 pounds, and fine fescue at 4.5 is 22.5 pounds. For overseeding, use half — 20 pounds of tall fescue for 5,000 sq ft. Enter your own area and grass type in the calculator for an exact figure.
Seed size and growth habit vary a lot. Kentucky bluegrass seed is tiny — hundreds of thousands of seeds per pound — and it spreads on its own by rhizomes, so a low 2.5 lb per 1,000 sq ft rate covers the ground. Tall fescue seed is large and the plant is bunch-type, so it doesn't fill gaps and needs about 8 lb. Bermuda and zoysia seed are very fine and the grasses spread aggressively, so their rates are the lowest. Matching the rate to the grass is why per-pound coverage differs.
It doesn't change the seeding rate, but it strongly affects how much of that seed actually grows. Seed sitting on top of thatch or hard, unraked soil germinates poorly, so people over-apply to compensate — wasting seed and crowding seedlings. Rake bare soil before seeding, lightly cover the seed (about a quarter inch), and core-aerate before overseeding so seed reaches soil. Good contact lets you use the standard rate and still get a thick stand.
Keep the top inch of soil consistently moist until the seed germinates — usually light watering once or twice a day for the first two to three weeks, more in hot or windy weather. The surface shouldn't dry out, but it shouldn't be soggy either. Once the grass is up and mowed once or twice, taper to deeper, less frequent watering to build deep roots. The seeding rate sets how much seed you bought; watering decides how much of it survives.
Yes. The calculator lets you enter length and width in feet and multiplies them to get square feet, or you can type the square footage directly if you already know it. For an irregular lawn, break it into rectangles, find each rectangle's area, and add them together. Getting the area right matters more than any other input, because the seed amount scales directly with it.
Common mistakes
Getting the pound total right is only half the job. These four errors are where the
calculation goes right but the lawn still fails.
Over-seeding in hope of a thicker stand
Applying more seed than the recommended rate does not produce a thicker lawn — it produces crowded seedlings competing for water and light, which leads to weaker establishment. University turf programs note consistently that exceeding the recommended rate wastes seed without improving the stand. If the lawn looks thin after germination, the cause is nearly always poor soil contact, dry conditions, or wrong timing — not insufficient seed.
Seeding at the wrong time of year
Cool-season grasses (tall fescue, Kentucky bluegrass, perennial ryegrass, fine fescue) establish best when soil temperatures are between roughly 50 and 65 °F — early fall in most northern regions, and secondarily late spring. Seeding in midsummer means seedlings emerge into heat and drought stress. The same seed applied in early September will dramatically outperform seed applied in July, regardless of how carefully the rate was calculated.
Applying the new-lawn rate when overseeding
Overseeding into established turf uses roughly half the new-lawn rate — approximately 4 lb per 1,000 sq ft for tall fescue versus 8 lb for bare ground. Applying the full new-lawn rate to an overseeding job wastes seed and crowds seedlings. The calculator applies the correct half-rate automatically when you select the overseeding mode; the error happens when someone uses the new-lawn rate anyway on the assumption that more is better.
Skipping soil preparation
The seeding rate assumes reasonable seed-to-soil contact. Seed landing on thick thatch or hard-packed, crusted ground has poor contact and low germination. Before seeding new ground, rake or till the surface so seed makes contact with soil. Before overseeding, core-aerate to open channels. A correctly-seeded bed with good contact will outperform a double rate scattered onto thatch.