How to use this calculator
- Enter Area in sq ft.
- Enter Purpose.
- Press Calculate. The highlighted row is your order quantity; the note beneath it translates the number into real-world terms.
Formula & constants
New lawns: 4–8 lb per 1,000 sq ft depending on species (KBG 2–3, fescue 6–8, ryegrass 8–10). Overseeding uses roughly half the new-lawn rate. Every default in the fields above is editable — when your supplier’s spec sheet lists a different density, coverage rate or price, enter that number instead. The waste and compaction allowances follow common trade practice; see our methodology page for the derivation of each formula and the standards it references.
Where this fits in the project
Hardscape follows the same layer logic as paving: excavate, place compacted base and bedding sand, then set surface units. Bulk organics like mulch and topsoil are ordered by the cubic yard.
How this connects to your project
No quantity stands alone — each material in the chain depends on the ones around it. These are the planning steps that pair with the grass seed calculator:
- Sod Calculator — Seed is the economical alternative to sod.
- Topsoil Calculator — Grass seed germinates in prepared topsoil.
- Fertilizer Calculator — Starter fertilizer is applied with grass seed.
- Compost Calculator — Compost is mixed into soil before seeding.
- Mulch Calculator — Seeded lawn vs mulched garden beds.
Frequently asked questions
Why do seeding rates differ so much?
Seed size — bluegrass has ~1.4 million seeds/lb, tall fescue ~220,000. Rates equalize seeds per square inch.
Does more seed grow a thicker lawn?
No — overdosing causes crowding and damping-off. Hit the labeled rate and water correctly instead.
Last verified: — prices reflect current national averages. See our methodology.
Estimates are for planning. Material densities, coverage rates and prices vary by region and supplier — confirm final quantities before ordering, and check local code where structural or electrical work is involved.