Grass Seed Calculator - Free Online Lawn Seed Tool | IconVault
Work out how much grass seed your lawn needs by length x width or acres, for new lawns or overseeding, with bag counts. Free, runs in your browser.
Grass Seed Calculator
How much seed your lawn needs, in bags
Lawn area
Length (ft)
Width (ft)
Job type
New lawns take roughly 5 to 10 lbs per 1,000 sq ft; overseeding takes about half that.
Adjust to match your seed bag. Fine fescue and rye blends often list their own rate.
Bag size
5 of 5 free copies left - everything runs on your device.
Seed needed
9.6 lbs
Buy 1 x 25 lb bag (rounded up)
- Lawn area
- 1,200 sq ft
- Rate
- 8 lbs / 1k sq ft
- Total seed
- 9.6 lbs
Irregular lawns: measure in rectangles and add the pieces together. Keep the seed bag label as the final word, since coated or blended seed rates differ.
About this tool
IconVault's Grass Seed Calculator tells you exactly how much grass seed to buy. Enter your lawn by length x width or by acres, choose new lawn or overseeding, set your seeding rate in pounds per 1,000 sq ft, and pick a bag size.
It instantly computes the lawn area, the total pounds of seed and how many bags that means, with a one-click copy of the estimate. New lawns default to 8 lbs per 1,000 sq ft and overseeding to 4, matching common guidance. It is free with no signup and runs fully in your browser. The honest caveat: rates vary by seed blend and region, so treat this as a planning estimate and check your seed bag's label before buying.
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