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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 in United States units and terminology, and each formula’s basis is cited under regulatory standards below.

Last verified 2026-08-25 · v1.0.0

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

Estimated grass seed needed

4.29 lb of seed

High confidence
Lawn area
858 sq ft

For the dimensions entered, expect a result of 4.29 lb of seed. Set for United States. The market selector changes the units and the trade terminology; any standard behind the formula is cited under sources.

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 — a confirmed fix gets a permanent check of its own, so the same mistake cannot come back.

Presented in US customary units and US trade terminology. Where a formula follows a published standard, that standard and its edition are cited beside it on this page; where none governs, the page says so. Local amendments override model codes — verify against the code in force where you build.

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.