Lawn Seed & Fertiliser Calculator
Different jobs need very different seeding rates. Choose new lawn or overseeding and get the weight of seed and fertiliser to buy.
- Fertiliser
- 3 lb
- Lawn area
- 0.023 acres
- · Seed in early autumn where possible — soil is warm, weeds are slowing and rain is reliable.
How to use the Lawn Seed & Fertiliser Calculator
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01
Measure the longest lawn length and width in feet.
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02
Choose overseeding, a new lawn or a higher-rate hard-wearing mix.
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03
Enter the application rate printed on your fertiliser bag.
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04
Divide the materials into two passes at right angles for more even coverage.
Frequently asked questions
When is the best time to seed?
Early autumn is usually best because soil remains warm, weed pressure falls and rainfall is more reliable.
Can I use the same rate for every grass mix?
No. Use the supplier's rate where available; seed size and recommended density vary by blend.
Should I fertilise at the same time?
A starter fertiliser can help new lawns, but soil testing prevents unnecessary nutrients and reduces runoff.
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These calculators give planning estimates based on the figures you enter. They are not a substitute for a site survey, a structural or load calculation, or professional advice. Always confirm quantities with your supplier or contractor before ordering.