Use this free grass seed calculator to plan a home-improvement or DIY project from the measurements and product information you already have.
HomeCalc shows the formula behind the result and keeps product-dependent assumptions editable where possible, so the calculator can match the material, package or supplier you actually plan to use.
🧮 Quick answer
Enter lawn dimensions and the seeding rate printed on your seed bag. Rates vary substantially by grass type and purpose.
Enter lawn dimensions and the seeding rate printed on your seed bag. Rates vary substantially by grass type and purpose.
FREE GRASS SEED ESTIMATOR
Grass Seed Calculator: Pounds of Seed Needed
Estimate grass seed quantity using lawn area and an editable pounds-per-1,000-sq-ft application rate.
Estimated result
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Planning estimate: real material requirements can vary with measurements, cuts, waste,
product yield, installation method and supplier packaging. Check the manufacturer or supplier information before buying.
Use the seed rate for the exact grass product
Grass seed is normally specified as a weight per unit area. HomeCalc calculates lawn square footage and multiplies it by the pounds-per-1,000-sq-ft rate you enter.
HomeCalc formula
lawn sq ft ÷ 1,000 × seeding rate = pounds of seed
What to check before using the result
- Use the seeding rate printed on the exact seed blend or species.
- New-lawn and overseeding rates can be different for the same product.
- Exclude patios, buildings and planting beds from the lawn area.
- Do not increase seed rate blindly; follow the product and local turf guidance.
The seeding-rate field is the important variable
Different grasses and uses can require very different application rates. A universal pounds-per-acre assumption would make the calculator less useful, so HomeCalc lets the product rate drive the result.
Different grasses and uses can require very different application rates. A universal pounds-per-acre assumption would make the calculator less useful, so HomeCalc lets the product rate drive the result.
Frequently asked questions
Why is the rate entered per 1,000 sq ft?
That is a common way seed products express application rate, making it easy to scale to the measured lawn area.
Is overseeding the same rate as a new lawn?
Not necessarily. Use the rate specified for the job you are doing.
Can I use this for a seed blend?
Yes. Use the application rate printed on that blend's bag or technical information.