Grass Seed Calculator
Lawn Area (m²)
Seeding Type
A grass seed calculator determines the amount of seed required to establish or overseed a lawn. Seeding rates vary by grass species and whether you are creating a new lawn or overseeding an existing one (which requires less seed).
- 1Measure lawn area in square metres
- 2Choose application rate: new lawn 35g/m², overseeding 25g/m²
- 3Total seed = Area × Application rate
- 4Add 10% contingency for uneven distribution
50m² new lawn=~1.75kg seed50 × 35g = 1,750g = 1.75kg
100m² overseeding=~2.75kg seed100 × 25g + 10% = 2.75kg
| Situation | Rate (g/m²) | Notes |
|---|---|---|
| New lawn — standard | 35g | Good seed-to-soil contact needed |
| New lawn — premium | 50g | Higher rate for patchy results |
| Overseeding existing | 25g | Scarify first for best results |
| Spot repair | 50g | Higher rate for bare patches |
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