GRASS SEED
How much grass seed per square foot?
Divide the published rate by 1,000. A rate of 5 pounds per 1,000 square feet is 5 ÷ 1,000 = 0.005 pounds per square foot. That is the whole conversion — seeding rates are published per thousand square feet because the numbers are easier to read that way, not because the unit means anything different.
Why the per-square-foot figure is rarely what you order from
It is a useful number for checking, and a useless one for buying. Nobody sells 0.005 pounds of seed; you buy a bag with a weight printed on it. So the practical flow is: measure the area, multiply by the per-thousand rate for your species, and divide by the bag weight. The per-square-foot figure only appears when you want to sanity-check a rate against another source.
Published rates expressed both ways
| Per 1,000 sq ft | Per square foot |
|---|---|
| 1 lb | 0.001 lb |
| 2 lb | 0.002 lb |
| 3 lb | 0.003 lb |
| 4 lb | 0.004 lb |
| 5 lb | 0.005 lb |
| 6 lb | 0.006 lb |
| 8 lb | 0.008 lb |
| 10 lb | 0.010 lb |
The table is pure arithmetic — each row is the left column divided by 1,000. It is not a set of recommendations: which rate applies to your lawn comes from your seed label or your state extension service, and it varies by species and by whether you are establishing or overseeding.
Worked example
A 2,500 sq ft lawn at 4 pounds per 1,000 square feet. Two routes, same answer:
- Per thousand: 2,500 ÷ 1,000 = 2.5, and 2.5 × 4 = 10 lb
- Per square foot: 4 ÷ 1,000 = 0.004 lb per sq ft, and 2,500 × 0.004 = 10 lb
Use whichever is easier to hold in your head. The per-thousand route is usually simpler because published rates arrive in those units.
When the rate you have is per acre
Some agricultural and turf sources publish per acre instead. One acre is 43,560 square feet, so a rate per acre converts with ÷ 43,560 to get pounds per square foot, or × 0.02296 to get pounds per 1,000 square feet. A 100 lb per acre rate is therefore about 2.3 lb per 1,000 square feet — worth checking, because rates quoted per acre and per thousand square feet get compared by mistake more often than you would think.
The measurement is the part people get wrong
The seed arithmetic is one multiplication and it cannot really go wrong. The area can. Measure the lawn in simple shapes — rectangles as length × width, circles as π × radius² — and subtract beds, paths, the drive and the ground under shrubs before you convert. On an overseed, nothing comes off, because you are seeding over the existing grass.
Related calculators
The grass seed calculator runs this arithmetic with the published rates by species laid out, and how much grass seed do I need walks through it step by step. If you are laying turf instead, how many square feet in a pallet of sod is the equivalent question.
The conversions on this page are arithmetic from the definitions 1,000 square feet (the published rate basis) and 1 acre = 43,560 square feet. No seeding rate is recommended here; rates come from the seed label or your state extension service.