Grass seed for a repair job

    Pick your lawn type, measure the area, get the exact seed weight. Five lawn types from utility (25-30 g/m2) to ornamental (45 g/m2), package count in 1 kg and 5 kg bags, and optional cost estimate at your local price per kilogram.

    This page opens with repair job already chosen, so nothing has to be hunted for in the list. Sowing rate for a repair is a third of what a show lawn wants, so one bag covers wildly different areas depending on the job. This page opens the calculator with repair job already selected, so only the remaining fields are left to fill in. Change the other fields to your own numbers and press the button; the formula appears under the answer.

    Parameters

    Enter data for calculations

    Measure length x width and multiply (e.g. 10 m x 10 m = 100 m2)

    Utility: home garden | Sports: heavy foot traffic | Ornamental: premium display lawn

    Enter your local seed price for a total cost estimate

    Form progress0 / 2 fields

    💡 Fill in all required fields to unlock the calculate button

    Lawn seed calculator - seeding rates, bags and cost

    Measure your lawn area, pick the lawn type, and get the seed weight in grams and kilograms, plus bag counts for 1 kg and 5 kg packages. A 200 m2 utility lawn at 27.5 g/m2 needs 5.5 kg of seed - that is 2 bags of 5 kg with a small reserve for patching.

    How to calculate lawn seed - step by step

    1. Lawn area (m2) - measure length x width of the area to be seeded. Subtract paths, flower beds and structures.
    2. Lawn type - utility (27.5 g/m2), new from scratch (30 g/m2), overseeding (15 g/m2), sports (40 g/m2) or ornamental (45 g/m2).
    3. Seed price (optional) - enter the price per kg from your supplier for a cost estimate.
    4. Read the results - total seed weight, bag count (1 kg and 5 kg), seeding rate and cost.

    Quick start - common lawn sizes

    100 m2 utility lawn: 2.75 kg seed, 3 bags x 1 kg or 1 bag x 5 kg. At $12/kg = $33.

    Seeding rate by lawn type

    Lawn type Rate (g/m2) Per 100 m2 Best for
    Utility 25-30 2.75 kg Home gardens, moderate traffic
    New lawn 30 3.0 kg Starting from bare soil
    Overseeding 15 1.5 kg Filling bare patches, thickening
    Sports 40 4.0 kg Play areas, heavy foot traffic
    Ornamental 45 4.5 kg Show lawns, fine-leaved mix

    Scenarios - real-world examples

    Small back garden (50 m2, utility): 50 x 27.5 = 1,375 g = 1.38 kg. Buy 2 x 1 kg bags. Cost at $12/kg: $17.
    Medium front + back (200 m2, new lawn): 200 x 30 = 6,000 g = 6.0 kg. Buy 2 x 5 kg bags (4 kg reserve). Cost at $12/kg: $72.
    Large property (500 m2, utility): 500 x 27.5 = 13,750 g = 13.75 kg. Buy 3 x 5 kg bags. Cost at $10/kg (bulk): $138.
    Patchy lawn repair (150 m2, overseeding): 150 x 15 = 2,250 g = 2.25 kg. Buy 3 x 1 kg bags. Cost at $12/kg: $27.
    Kids' play area (80 m2, sports): 80 x 40 = 3,200 g = 3.2 kg. Buy 1 x 5 kg bag (1.8 kg reserve for re-seeding wear spots). Cost at $15/kg: $48.
    Show lawn (100 m2, ornamental): 100 x 45 = 4,500 g = 4.5 kg. Buy 1 x 5 kg bag. Cost at $22/kg (premium): $99.

    Seed cost comparison

    Prices vary widely by blend quality. Here is what 200 m2 of new lawn costs across price tiers:

    Seed quality Price/kg 6 kg cost What you get
    Budget $5-8 $30-48 Fast germination, coarse texture, lower density
    Mid-range $10-15 $60-90 Good mix of ryegrass + fescue, reliable coverage
    Premium $18-25 $108-150 Fine fescue blend, dense turf, drought-resistant

    FAQ

    When is the best time to sow grass seed?
    Early autumn (September-October) is ideal - soil is still warm from summer, rainfall increases, and there is less competition from weeds. Spring (April-May) is the second-best window. Avoid mid-summer heat and winter frost. Soil temperature should be at least 8-10 C for germination.
    Should I buy extra seed as a buffer?
    Yes. Buy 10-15% more than the calculator suggests. Reasons: uneven spreading, seed blown by wind, birds eating seed, slopes where seed rolls, and inevitable bare patches that need re-seeding after 2-3 weeks. Leftover seed stores well for 2-3 years in a cool, dry place.
    What is the difference between overseeding and new lawn rates?
    A new lawn starts from bare soil - you need 30 g/m2 for full coverage. Overseeding adds seed to an existing lawn to fill gaps, so you only need 15 g/m2 (half the rate). The existing grass already covers most of the area; you are just filling in.
    Does more seed mean a better lawn?
    Not necessarily. Over-seeding (too much seed) causes seedlings to compete for water, nutrients and light, producing weak, thin grass. Stick to the recommended rate. If you want a denser lawn, use a higher-quality mix with fine fescue rather than simply adding more seed.
    How long until the lawn is ready to walk on?
    Germination takes 7-21 days depending on species and temperature. First mow at 6-8 weeks when grass reaches 8-10 cm. Light foot traffic after 8-10 weeks. Full use (sports, play) after 3-4 months. Ornamental lawns may need a full growing season to mature.
    1 kg bags or 5 kg bags - which is cheaper?
    Almost always 5 kg bags. The per-kg price drops by 15-30% compared to 1 kg packaging. For areas over 150 m2, buying in 5 kg bags saves real money. Store unused seed in an airtight container - it keeps for 2-3 years.

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    See also

    Grass Seed for 50 m2 - How Much Do You Need?Grass Seed for 100 m2 - How Much Do You Need?Grass Seed for 150 m2 - How Much Do You Need?Grass Seed for 200 m2 - How Much Do You Need?Grass Seed for 250 m2 - How Much Do You Need?Grass Seed for 300 m2 - How Much Do You Need?Grass Seed for 400 m2 - How Much Do You Need?Grass Seed for 500 m2 - How Much Do You Need?Grass Seed for 750 m2 - How Much Do You Need?Grass Seed for 1000 m2 - How Much Do You Need?

    Calculator verified by the LiczGrupa.pl team

    Content, formulas and results have been reviewed for accuracy and relevance by our team of specialists.

    Patryk Matyjasik

    Reviewed by: Patryk Matyjasik

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