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Lawn Seed Calculator

Estimate lawn seed quantity from area and coverage rate.

Use the rate recommended on the seed box for new lawns, overseeding or repairs.

Notes and next steps

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How it works

Estimate grass seed quantity from lawn area, seed rate and waste allowance.

Estimating method: Seed quantity = lawn area × seed rate × (1 + waste percentage ÷ 100).

Worked example

40 m² at 35 g/m² with 10% allowance needs 1540 g, or about 1.54 kg.

Common mistakes
  • Using a seed rate meant for overseeding on a new lawn.
  • Not preparing the soil before sowing.
  • Forgetting birds, patchy areas and follow-up overseeding.
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