Grass Seed Calculator

Estimate the amount of grass seed needed for new planing or over-seeding by entering the size of the land and selecting the variety of grass.

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How to Find the Amount of Grass Seed Needed

Find the amount of grass seed by finding the square footage of the land and the pounds of grass seed per 1000 square feet of land needed.

Grass seed is a cost-effective alternative to sod, and also has the added benefit allowing the grass to develop in the environment in which it will live. There are also many more varieties of seed than there is sod. Some drawbacks to seed are the long time it can take for the lawn to fill in and the critical timing of the planting season. If you’re going to be planting seed, you need to decide how much to order to ensure you have enough coverage without excess waste. If you do choose to use sod, use our sod calculator to estimate the amount of sod needed for your lawn. Learn more about lawn and landscaping pricing in your area and find contractors that can assist with seeding your lawn.

Find the Coverage Rate of the Seed

The amount of grass seed needed to plant is based on the size of the land and the variety of grass being planted. Different varieties of grass have varying coverage rates, texture, hardiness and drought tolerance. There is also a different coverage rate when planting a new lawn and over-seeding. Your supplier should know the coverage rate of the variety you’re purchasing, which is often indicated in pounds of grass seed per 1000 square feet of land to be covered. Refer to the table below for the coverage rates for common varieties of grass.

Grass seed coverage rates for common grass varieties.
Variety Pounds of Seed per 1000ft2
Bahia New Lawn: 10lbs per 1000ft2
Overseeding: 5lbs per 1000ft2
Bermuda New Lawn: 2lbs per 1000ft2
Overseeding: 1lb per 1000ft2
Buffalo New Lawn: 3lbs per 1000ft2
Overseeding: 1.5lbs per 1000ft2
Centipede New Lawn: .5lbs per 1000ft2
Overseeding: .3lbs per 1000ft2
Creeping Red Fescue New Lawn: 5lbs per 1000ft2
Overseeding: 2.5lbs per 1000ft2
Fine Fescue New Lawn: 5lbs per 1000ft2
Overseeding: 2.5lbs per 1000ft2
Kentucky Blue Grass New Lawn: 4lbs per 1000ft2
Overseeding: 2lbs per 1000ft2
Perennial Ryegrass New Lawn: 10lbs per 1000ft2
Overseeding: 5lbs per 1000ft2
St. Augustine New Lawn: 2lbs per 1000ft2
Overseeding: 1lb per 1000ft2
Sun & Shade Mix New Lawn: 6lbs per 1000ft2
Overseeding: 3lbs per 1000ft2
Tall Fescue New Lawn: 10lbs per 1000ft2
Overseeding: 5lbs per 1000ft2
Zoysia New Lawn: 2lbs per 1000ft2
Overseeding: 1lb per 1000ft2

Find the Square Footage of the Land

Once the coverage rate has been identified it is time to find the total area that needs to be planted. There are 43,560 square feet in an acre. If you know the acreage of your land, multiply the acres by 43,560 to get the square footage or use our acres to square feet conversion calculator. If you know the length and width of the land you can multiply them together to get the area in square feet.

Find the Total Amount of Seed Needed

The final step to finding how much seed will be needed is to divide the total square footage by 1,000 and then multiply by the coverage rater per 1,000 square feet. This will give you the total number of pounds of seed needed for the project. Seed is usually sold by the bag, often in 10lb, 20lb, and 50lb bags.