Grass Seed Calculator
Tip: Best time to seed: early fall for cool season grasses, late spring for warm season grasses.
How to Calculate Grass Seed Amounts
Measure your lawn area in square feet.
Select your grass type — each has a different recommended seeding rate.
Choose new lawn or overseeding — overseeding requires about half the seed.
The calculator applies the rate per 1,000 sq ft to your total area.
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Frequently Asked Questions
It depends on the grass type. Kentucky Bluegrass needs about 2–3 lbs per 1,000 sq ft (new lawn), while Tall Fescue needs 6–8 lbs per 1,000 sq ft. Overseeding rates are roughly half of new lawn rates.
Yes. Over-seeding causes competition for water, nutrients, and light, leading to weak, spindly grass that's prone to disease. Follow the recommended rates for your grass type.
Sod gives you an instant lawn but costs 10–20x more than seed. Seed takes 4–8 weeks to establish but is much more affordable. Seed is best for large areas and patient homeowners; sod is best for quick results and erosion-prone slopes.
Cool season grasses: early fall (September–October) when soil is warm and air is cool. Warm season grasses: late spring (May–June) when soil temperatures reach 65–70°F. Avoid seeding in summer heat.
Perennial Ryegrass: 5–7 days. Tall Fescue: 7–12 days. Kentucky Bluegrass: 14–28 days. Fine Fescue: 7–14 days. Warm season grasses: 14–30 days. Keep soil consistently moist during germination.