How to Calculate Grass Seed Per Acre

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Caring for your lawn requires more than cutting it during the spring and summer (and not letting it get overgrown) and raking it during the fall. You also need to occasionally replenish the grass in your yard with grass seed to keep it green, vibrant and growing. The biggest concern when doing so is determining the correct amount of grass seed to use when seeding your lawn. This primarily on the climate of where you live and the type of grass you want to use on your lawn.

Determining the grass seed type you need

Before running out and buying a bunch of grass seed for your lawn, you first need to determine what type of grass you currently have. According to Lowe’s, grass seed comes in a variety of types suitable for particular climates, including:
Cool Season Grass
Grass Type Seed Rate Traffic Tolerance Soil Type Sun Exposure
Bentgrass High Light Tolerates acidic Full
Bluegrass Mid-range Light pH 6.5-7 neutral Full
Perennial
Ryegrass
Low High Most types Full
Fine Fescue Mid-range Light Most types Full/shade
Tall Fescue Mid-range High Most types Full/partial
Warm Season Grass
Grass Type Seed Rate Traffic Tolerance Soil Type Sun Exposure
Bahia High Moderate Many types Full/moderate
Bermuda High High Light textured Full
Centipede Low Light Tolerates acidic Full/partial
St. Augustine None-plugs only High Prefers sandy Full/parial
Zoysia Low High pH 5.5-6.5 slightly acidic Full/partial

Calculating the grass seed per acre

Materials Needed
  • Calculator
  • Digital measuring wheel
Once you determine what kind of grass seed you need for your yard, it is time to calculate how much grass seed you need for the amount of acres you need to seed. The following section walks you through the grass seed per-acre calculation process.
Step 1: Determine the acreage. Start by determining how many acres or part of an acre that you need to seed.
The easiest way to check is to measure the area yourself using a digital measuring wheel.
Divide your yard up into sections if necessary to make it easier to calculate the entire area. Measure the length and width of each section and multiply the two sums to get the total area. Once you have measured your whole yard, add the various totals together to get the total amount of square feet of your yard.
Finally, divide the square feet by 43,560 to get the total number of acres of your yard. If your lawn is smaller than an acre, then dividing the square feet by 43,560 should give you a sum indicating how much of an acre you have.
You can also use this acreage calculator from inchcalculator.com to determine how many acres your yard holds.
Step 2: Check the grass seed rate. Next, look at the seed rate on the bag of the grass type you want to buy.
Manufacturers usually indicate on the bag of grass seed how many pounds of grass seed to use per 1,000 square feet of lawn.
Step 3: Calculate the pounds of grass seed needed. Once you have the seed rate, calculate it by 43.56.
43.56 is the number you get when you divide the size of an acre by 1,000. So, 43,560 divided by 1,000 is equal to 43.56.
Multiply the manufacturer’s recommended pounds of seed per 1,000 square feet by 43.56 to get the amount you need per acre.
Step 4: Calculate the seeding rate. Finally, calculate the amount of pounds of grass seed needed per 1,000 square feet determined in the step above by the number of acres you need to seed.
When calculating how much grass seed you need, round up to the next whole pound. So, if you need 349.4 pounds of grass seed, round up to 350 pounds.
Step 5: Determine the number of bags. Once you have the number of pounds of grass seed you need for your yard, divide the number of pounds by the size of a bag of the grass seed you intend to use.
So, if the grass seed you want to use comes in five-pound bags, then you need 70 bags of grass seed if your calculations told you that you need 350 pounds to seed your whole yard.
It is important to occasionally seed your lawn to keep it looking healthy and growing strong. Otherwise, your grass could thin or even die in spots. When seeding your yard, you should consider doing it at the same time that you de-thatch and aerate your lawn to give the seed you do spread a better chance of getting a foothold. If you are unsure about seeding your lawn yourself, consider hiring a lawn care professional to do the job for you.

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