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Grass Seed Calculator

Estimate how many pounds of grass seed you need, based on lawn area and your seed product's recommended rate.

Computed in your browser — nothing you enter is uploaded. Figures are presented for United States against IRC 2024, and every formula is cited under regulatory standards below.

Last verified 2026-08-25 · v1.0.0

Market
Imperial · sales tax
32.81 ft26.25 ft
Schematic, drawn to the proportions you entered — not to scale on screen.

Estimated grass seed needed

4.31 lb of seed

High confidence
Lawn area
861.11 sq ft

For the dimensions entered, expect a result of 4.31 lb of seed. Note that lawn length and lawn width sit at the edge of the range this calculator was checked against, so treat the output as indicative rather than settled. Set for United States against IRC 2024. The market selector changes both the units and the code cited.

Estimated cost — your price

This site holds no price list for this material — local prices vary too much to publish honestly. Enter your supplier's price and the result is costed with it.

Preliminary estimate, not certified engineering. This tool produces an indicative quantity calculation for planning purposes only — it is not a certified structural analysis, a guaranteed material takeoff, or a substitute for building department approval. Always verify measurements on-site and have a licensed contractor or structural engineer review any load-bearing, code-sensitive, or safety-critical work before purchasing materials or starting construction. Spotted an arithmetic or standards error? Report it to contact@craftquantities.com with your inputs — confirmed fixes become pinned regression tests.

[Schema Verified] Computed in alignment with American Concrete Institute (ACI 318-19) formulas and International Residential Code (IRC 2024) spatial boundaries.

Regulatory standards & verification citations

  • Seeding rates vary significantly by grass species (roughly 2-8 lb per 1,000 sq ft) — always use the rate printed on your specific product label

Your workspace

Most jobs need more than one number. Add the calculators you need next and they open right here, underneath this one — your figures stay on screen and nothing is lost to a page change.

Frequently asked questions

Why isn't there one universal seeding rate?
Seed size and germination habits vary a lot by grass species — a fine fescue seed is much smaller than a tall fescue or ryegrass seed, so the same weight covers different areas at different densities.
Overseeding vs new lawn — does the rate change?
Yes — overseeding an existing lawn typically uses a lower rate (since some grass is already there) than establishing a completely new lawn from bare soil. Check your product label for both rates.
Does soil prep matter as much as seed quantity?
Very much so — good seed-to-soil contact, consistent moisture, and appropriate timing for your grass type and climate matter as much as getting the seed quantity right.