Seeding half an acre (21,780 sq ft) as a new lawn takes about 174.2 lb of tall fescue or 54.5 lb of Kentucky bluegrass. Overseeding an existing lawn takes roughly half as much.
Change the numbers
The calculator below is pre-filled for this project. Adjust any value — including feet and inches — and the results update instantly.
Rates are typical mid-range values; your seed bag’s rate takes priority.
Your results
Grass seed needed174.2 lb
Buy at least175 lb
Rate used8 lb per 1,000 sq ft
Lawn area21,780 sq ft
Seed for half an acre by grass type
Grass
New lawn
Overseeding
Tall fescue
174.2 lb
87.1 lb
Kentucky bluegrass
54.5 lb
27.2 lb
Perennial ryegrass
152.5 lb
76.2 lb
Fine fescue
98 lb
49 lb
Bermudagrass, hulled
32.7 lb
16.3 lb
Bahiagrass
163.4 lb
81.7 lb
Centipedegrass
10.9 lb
5.4 lb
Seed blends list a seeding rate on the bag; when they do, use it instead of the species rates above.
The math (tall fescue)
21,780 ÷ 1,000 × 8 lb = 174.2 lb
Common questions
How much grass seed for half an acre?
About 174.2 lb of tall fescue or 54.5 lb of Kentucky bluegrass for a new lawn; about half for overseeding.
