Seed Coverage Calculator
Work out grass seed weight for a lawn area, with an allowance.
Quick answer: enter your details below and click Calculate Seed — your result appears instantly, right here in your browser. Nothing you enter is uploaded or stored.
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Enter your details below.
How to use
- Measure the lawn area in square metres.
- Enter the sowing rate from the seed packaging.
- Click Calculate Seed.
About this tool
Enter the lawn area and the sowing rate in grams per square metre, and the tool multiplies them, adds a 10 percent allowance for uneven spreading, and gives the weight in kilograms. The allowance is shown separately.
Frequently asked questions
Can I sow by hand evenly?
A spreader gives a more even result than hand scattering, especially on larger lawns.
What if I sow too thickly?
Overcrowded seedlings compete and weaken, so stick close to the packaging rate.