Calculate how many kilograms of perennial ryegrass seed you need for a new UK lawn or overseeding — using realistic 30–50 g/m² rates.[web:28][web:30][web:31][web:3]
Perennial ryegrass is the most common UK hard-wearing lawn grass. New lawns are usually sown at 35–50 g/m², with overseeding at 15–35 g/m² depending on how thin the lawn is.[web:3][web:28][web:30][web:31]
For family lawns, play areas and general UK gardens
This table shows common UK product rates and coverage for new lawns and overseeding, based on 10–20 kg bags of perennial ryegrass mixes.[web:28][web:29][web:30][web:31][web:32]
| Use | Recommended Rate (g/m²) | 5 kg Bag Coverage (m²) | 10 kg Bag Coverage (m²) | 20 kg Bag Coverage (m²) |
|---|---|---|---|---|
| New lawn (budget / mixed) | 30 g/m² | ≈ 165 m² | ≈ 330 m² | ≈ 660 m² |
| New lawn (sport / hard-wearing) | 35–40 g/m² | ≈ 125–143 m² | ≈ 250–286 m² | ≈ 500–572 m² |
| Overseeding thin lawn | 15–25 g/m² | ≈ 200–333 m² | ≈ 400–666 m² | ≈ 800–1333 m² |
| Overseeding sports pitch | 25–35 g/m² | ≈ 143–200 m² | ≈ 286–400 m² | ≈ 572–800 m² |
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Most UK “family lawn” and “repair” products are based around high-quality amenity perennial ryegrass for fast germination and durability.[web:30][web:32]
Used on many sports surfaces and busy family gardens. Germinates in as little as 7–10 days in warm UK soil.[web:30][web:32]
Often 50–95% perennial ryegrass plus fine fescues for better appearance and drought tolerance.[web:31][web:32]
Designed to knit into existing turf quickly after scarifying, using high-purity ryegrass cultivars.[web:30]
Why ryegrass dominates UK family lawns and how its seed rates compare to fine lawn mixes.[web:3][web:30][web:32]
Perennial ryegrass germinates faster than most other lawn species — often within 7–10 days in warm, moist UK soil.[web:30][web:32] It forms a dense, wear-tolerant sward ideal for children, pets and heavy foot traffic.
Modern amenity cultivars are far finer-leaved than old agricultural ryegrass and can give an attractive lawn finish when mown regularly at 20–35mm.[web:32]
Fine fescue and bent blends are often sown at 25–35 g/m² for new lawns, while pure or high-ryegrass mixes are commonly used at 35–40 g/m², or up to 50 g/m² for sports use.[web:3][web:29][web:31][web:32]
For overseeding, ryegrass products are typically used at 15–30 g/m², compared to 20–35 g/m² on sports pitches or heavily worn areas.[web:3][web:30][web:31]
Assuming 100 m² at 40 g/m² (hard-wearing new lawn rate):[web:3][web:29]
For overseeding the same 100 m² at 20 g/m², you would need only 2.0 kg, meaning most of a 5 kg bag would be left for future use.
Common questions on seeding rates, overseeding and bag sizes for UK ryegrass lawns.
Use the calculator to find your exact kilograms, then choose a high-purity, UK-certified perennial ryegrass mix for fast, durable coverage.
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