Landscaping
Grass Seed Calculator
Calculate how much grass seed a lawn needs for new seeding or overseeding.
Result
Overseeding uses about half the rate of a new lawn. Rates vary by species. Fine fescues and ryegrass need considerably more per thousand square feet than bluegrass.
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About this calculator
When should I seed?
Early autumn is best for cool-season grasses: warm soil, cooler air and less weed competition. Late spring is second best; summer seeding usually fails without constant irrigation.
Can I use too much seed?
Yes. Over-seeded lawns produce crowded, weak seedlings that compete with each other and are more prone to disease.
The formula
seed (lb) = area ÷ 1,000 × seeding rate
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