Calculate grass seed pounds from lawn square footage, seed application rate per 1,000 square feet and an optional extra allowance for overseeding or coverage.
Enter your measurements and material details.
Use the seeding rate printed for the exact grass species or seed blend and the job type.
The calculator divides lawn area by 1,000, multiplies by the pounds-per-1,000-square-feet rate and adds the selected allowance. The rate field is the key input and should come from the seed label.
Measure only the areas being seeded. Exclude buildings, pavement and established beds. New lawn seeding and overseeding can use different label rates, so choose the rate for your application.
Multiply 5 by the product rate in pounds per 1,000 square feet.
No. Use the rate on the seed label for your species or blend.
Yes. Enter the overseeding rate recommended for the product.
A small allowance can help with spreading variation, but do not greatly exceed label rates.
No. Use the fertilizer calculator separately.
Using the example inputs shown in the calculator — Lawn area (sq ft) = 5000, Seed rate (lb per 1,000 sq ft) = 5, Extra allowance (%) = 5 — the result is 26.25 lb. This demonstrates the formula with a complete set of numbers rather than a hidden assumption.
The result breakdown also shows Treatment area: 5,000 sq ft; Rate used: 5 lb/1,000 sq ft. Replace the example values with field measurements and the exact product coverage, yield or package size you plan to buy.
For this grass seed calculator, the inputs with the greatest practical effect are lawn area, seed rate and extra allowance. Recalculate when any of those change; do not reuse a result from a different room, run, layer depth or product specification.
Grass Seed Calculator is intended to help with quantity planning and arithmetic. It does not inspect the site, choose structural dimensions, determine code compliance or replace manufacturer installation instructions. Conditions such as slope, substrate quality, moisture, soil, framing, access and workmanship can change the final amount required.
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