Phone:
(701)814-6992
Physical address:
6296 Donnelly Plaza
Ratkeville, Bahamas.
Grass Seed Calculator
Calculate exactly how much grass seed you need for a lush, green lawn and estimate your costs.
Lawn Dimensions
Total length of the area.
Total width of the area.
Seed Parameters
Different seeds require different densities.
Overseeding uses about half the seed.
$
Check your local hardware store for pricing.
Estimated Total Requirements
5.00
Total Seed (Lbs)
$22.50
Estimated Cost
Lawn Coverage Visualizer
Seeds Dropped
Property Setup
Total Area
2,000 Sq Ft
Coverage Rate
2.5 lbs/1000sqft
What is a Grass Seed Calculator?
A Grass Seed Calculator helps you determine exactly how many pounds of seed you need to establish a new lawn or thicken up an existing one. Grass seeds range in size—tiny Bermuda seeds require much less weight to cover an area than large Fescue seeds.
By inputting the square footage of your yard and selecting your preferred grass type, this calculator prevents you from under-seeding (which leaves bare, patchy spots for weeds) or over-seeding (which causes young grass to choke itself out competing for resources).
Planning Your Lawn
3 Easy Steps
From bare dirt to a beautiful yard.
1
Measure the Area
Measure the length and width of the areas you wish to seed. If your lawn is complex, break it into smaller squares, calculate the area of each, and add them together.
2
Choose the Seed
Cool-season grasses (Fescue, Bluegrass) have different spread rates than warm-season grasses (Bermuda, Zoysia). Select the one best suited for your climate.
3
Define the Project
Determine if you are starting from bare dirt (New Lawn) or simply filling in an existing lawn (Overseeding). Overseeding usually takes about 50% as much seed.
The Grass Seeding Formula
Math for the Perfect Lawn
Grass seed is almost universally calculated based on a coverage rate per 1,000 square feet. The formula scales that base rate to your specific yard size.
Total Area = Length' × Width'
Seed Needed (Lbs) = (Area ÷ 1000) × Coverage Rate
Overseeding Rule = Seed Needed × 0.5
You may need to adjust your totals based on the bags available at the store (e.g., if you need 12 lbs, you may have to buy a 10 lb and a 3 lb bag, or a 20 lb bag depending on pricing).
New Lawn vs. Overseeding
New Lawns require you to establish a dense turf canopy entirely from scratch. You'll need the maximum recommended seed rate on bare, tilled soil to ensure weeds don't out-compete the young grass.
Overseeding is the practice of spreading seed over an already established lawn. It's done to fill in bare patches, thicken thin areas, and introduce new, resilient grass varieties into older turf. Because there is already grass present, overseeding requires roughly half the amount of seed.
Related Calculators
Frequently Asked Questions
Break your lawn down into smaller, manageable shapes like rectangles and triangles. Calculate the area of each shape individually, then add them all together to find your total usable square footage.
A new lawn is planted on bare dirt and requires the full recommended seed rate. Overseeding is broadcasting seed over an existing, established lawn to fill in patches, requiring only about half the normal amount of seed.
It depends on the grass. Cool-season grasses (like Fescue and Kentucky Bluegrass) are best planted in early Fall or early Spring. Warm-season grasses (like Bermuda and Zoysia) should be planted in late Spring or early Summer.
Covering seed with a light layer of straw or peat moss is highly recommended. It helps the soil retain moisture (crucial for germination), prevents seed from washing away in the rain, and hides it from hungry birds.
The top inch of soil must remain moist until the seeds germinate. This usually requires light watering 2 to 3 times a day. Once the grass is an inch tall, you can transition to deeper, less frequent watering.
Germination times vary by species. Perennial Ryegrass can sprout in 5-7 days, while Kentucky Bluegrass can take up to 14-21 days. Soil temperature and moisture levels heavily impact these timelines.
Yes! Throwing down too much seed creates intense competition for water, light, and soil nutrients. The crowded seedlings will become weak, thin, and highly susceptible to disease.
It is highly recommended to use a "starter fertilizer" when seeding. Starter fertilizers are richer in phosphorus, which is essential for rapid root development in young grass seedlings.
User Reviews
Chris T.
Homeowner
"Spot on! My new tall fescue lawn looks amazing thanks to buying the exact right amount of seed. No extra bags sitting in my garage!"
Sarah L.
DIY Landscaper
"Helpful, but had to figure out my irregular yard shapes myself before I could use the simple length x width inputs."
Mike P.
First-time Buyer
"Calculated the seed fine, but it doesn't factor in the cost of topsoil or starter fertilizer, so my overall budget was still short."
David M.
Property Manager
"Saved me from buying way too much expensive Zoysia seed! The rates built into the dropdown are super convenient."
Alan R.
Contractor
"Good layout. Would be cool to have a metric toggle option for our friends up north, but the foot calculation works great."
Beth C.
Landscaper
"Spot on! My new tall fescue lawn looks amazing thanks to buying the exact right amount of seed. No extra bags sitting in my garage!"
Have Feedback or a Question?
We'd love to hear from you! If you have suggestions, questions, or just want to say hello, please get in touch.