Formula
Seed (lb) = Area (sq ft) ÷ 1,000 × Seeding rate (lb per 1,000 sq ft)
Example: A 5,000 sq ft new lawn of tall fescue at 7 lb per 1,000 sq ft needs 35 lb of seed (15.9 kg). Overseeding the same lawn takes about 17.5 lb.
Seeding rates used (new lawn, lb per 1,000 sq ft)
- Tall fescue 7 · Perennial ryegrass 7 · Fine fescue 4
- Kentucky bluegrass 2.5 · Buffalograss 3
- Bermudagrass (hulled) 1.5 · Zoysia 1.5 · Centipede 0.5
Topping beds at the same time? The mulch calculator works out cubic yards.
Frequently asked questions
How much grass seed do I need per 1,000 sq ft?
It depends on the species: about 6–8 lb for tall fescue and perennial ryegrass, 2–3 lb for Kentucky bluegrass, 1–2 lb for hulled Bermudagrass and zoysia.
How much seed for overseeding?
About half the new-lawn rate, since existing grass fills most of the area.
How much seed for an acre?
An acre is 43,560 sq ft. Tall fescue at 7 lb per 1,000 sq ft needs about 305 lb per acre.
When is the best time to seed?
Early fall for cool-season grasses (fescue, bluegrass, ryegrass); late spring to early summer for warm-season grasses (Bermuda, zoysia, centipede).