Grass Seed Calculator

Multiply your lawn area (in 1,000 sq ft units) by the seed rate (in pounds per 1,000 sq ft). For example, a 4,000 sq ft lawn at 5 lb per 1,000 needs 20 lb of seed. The calculator adds a small waste allowance and rounds up to whole bags.

For a new lawn: 4 to 6 pounds per 1,000 sq ft of most cool-season blends. For overseeding existing lawn: 2 to 4 pounds per 1,000 sq ft. Warm-season grasses (Bermuda, zoysia) often seed at lower rates by weight because the seeds are smaller; check the bag.

Yes. Look for the percentage of pure live seed (PLS), germination rate, and inert matter on the bag label. A bag with 90% PLS and 85% germination is much more effective than one with 70% PLS and 70% germination.

Cool-season grass seeds best in early fall, then early spring as a second choice. Warm-season grass seeds best in late spring and early summer when soil is consistently warm. Avoid mid-summer for cool-season and avoid cold weather for warm-season.

Measure the area by hand (break it into rectangles and add them up) and enter the total in the 'Area override' field. The calculator uses whatever total area you provide.

Only as precise as the price you enter. Local prices vary widely, and the estimate does not include shipping, taxes, or any soil amendments. Use it as a planning number, not a quote.