Lawn Seed Calculator

How much grass seed does a new lawn actually take? Pick your grass, enter the area, and get a number.

Lawn area Square feet. A 50 × 40 ft yard is 2,000 sq ft.

Grass type Seeding rates below are typical Extension-published ranges for new lawns.

Grass

Seeding rate used

Seed needed

Buy, with ~10% extra for patch-ups

How it’s figured

Typical Extension-published new-lawn rates (lbs of seed per 1,000 sq ft): Kentucky bluegrass 2–3, Perennial ryegrass 5–8, Tall fescue 6–8, Fine fescue 3–5, Bermudagrass 1–2, Zoysiagrass 1–2, Buffalograss 3–5.
The calculator uses the midpoint of each range, since the “right” rate within the range depends on conditions.
Seed needed = lawn area ÷ 1,000 × midpoint rate.
The “with extra” line adds 10% for patch-ups.