Grass Seed Calculator

Calculate how many pounds of grass seed you need by grass type, for a new lawn or for overseeding an existing one.

Seed needed

1.2–1.6 lb

  • Lawn area200 ft²
  • Starter fertilizer (≈1 lb N / 1,000 ft²)0.2 lb nitrogen

Estimates only. Round up when you order, and confirm structural details with your local building code.

How to use it

  1. Enter the lawn size.
  2. Pick the grass type.
  3. Choose new lawn or overseeding.

The formula

Seed (lb) = area ÷ 1,000 × seeding rate

Overseeding uses about half the new-lawn rate

Worked example

Lawn Length20 ft
Lawn Width10 ft
Grass typeTall fescue (6–8 lb / 1,000 ft²)
JobNew lawn

Result

Seed needed1.2–1.6 lb
Lawn area200 ft²
Starter fertilizer (≈1 lb N / 1,000 ft²)0.2 lb nitrogen

Tips before you order

  • Seed cool-season grasses in late summer to early fall; warm-season grasses in late spring.
  • Rates on the seed bag override these typical ranges.

Questions

How much grass seed per 1,000 square feet?

Typical new-lawn rates: Kentucky bluegrass 2–3 lb, tall fescue 6–8 lb, perennial ryegrass 7–9 lb.