What is the Grass Seed Calculator?
The Grass Seed Calculator helps homeowners and professional landscapers determine the exact number of pounds of grass seed required for a lawn project. Accurate calculations prevent you from wasting money on excess seed or applying too little and ending up with a thin, patchy lawn.
How to Calculate Grass Seed Coverage (Formulas)
Seeding rates depend entirely on two factors: the species of grass (fescue vs. bermuda) and whether you are planting a brand new lawn from scratch or simply overseeding an existing lawn.
- Total Square Footage: Length * Width of the yard area.
- Total Pounds Formula: (Total Square Footage / 1,000) * Manufacturer's Recommended Seeding Rate. (The calculator handles metric conversions automatically).
Frequently Asked Questions
How much grass seed do I need for a new lawn?
If you are planting bare dirt, the rate is high. For example, Tall Fescue requires roughly 8 to 10 pounds of seed per 1,000 square feet. Kentucky Bluegrass, which has much smaller seeds, only requires 2 to 3 pounds per 1,000 square feet.
What does "overseeding" mean?
Overseeding is the process of spreading new grass seed directly over an existing, established lawn to fill in bare spots and thicken the turf. Because you already have grass, the overseeding rate is usually exactly half (50%) of the "new lawn" seeding rate.
What happens if I put down too much grass seed?
More seed does not equal better grass. If you spread seed too thickly, the seedlings will aggressively compete with each other for water, soil space, and nutrients. This overcrowding leads to weak root systems, making the entire lawn susceptible to fungal diseases and drought die-off.