Lawn Seed Calculator
Calculate how much grass seed you need for a new lawn or overseeding based on area and application type.
Seed Needed
Lawn seeding rates depend on whether you are establishing a new lawn or overseeding an existing one.
Metric rates:
- New lawn: 30–50 g per m² (use 40 g/m² as standard)
- Overseeding: 15–25 g per m² (use 20 g/m² as standard)
Imperial rates:
- New lawn: 6–8 lbs per 1,000 sq ft (use 7 lbs as standard)
- Overseeding: 3–4 lbs per 1,000 sq ft (use 3.5 lbs as standard)
Formula:
Seed Needed = Area × Seeding Rate
Tips for best results:
- Seed in early fall or early spring for cool-season grasses
- Keep soil consistently moist for 2–3 weeks after seeding
- Add 10–15% extra seed to account for birds, wind, and uneven coverage
- Use a starter fertilizer at the time of seeding