Calculate how much grass seed you need for a given area — with typical rates for common species.
The seed rate depends on the grass species, the seed size and whether you are establishing a new lawn or overseeding an existing one. Bermuda grass needs only 10-15 g/m² because the seeds are tiny; perennial ryegrass needs 30-40 g/m² because the seeds are larger and heavier.
Overseeding typically uses half the establishment rate. For renovation of bare patches, use the full rate. These are the manufacturer rates — the tool calculates the total from whatever rate you enter.
A common mistake is underseeding. Thin coverage lets weeds establish. Better to use the recommended rate and accept a slightly higher seed cost than to fight weeds for months.
Seed (grams) = area (m²) × rate (g/m²). 1 kg = 1,000 g.
No — overseeding typically uses 50-60% of the establishment rate, because existing grass fills some of the space.
Yes — if germination is 80%, you need 25% more seed. Most commercial seed has 85-95% germination.
For warm-season grasses (bermuda, zoysia): spring. For cool-season (ryegrass, fescue): autumn.
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