Lawns require seed and regular treatment to perpetually have thick grass with few or no weeds.  The treatments for lawns often come in the form of bags of treatment (seed, weed killer, fertilizer) from the home improvement store (e.g. Lowe's).  The common practice for the manufactures is to list the square feet covered by the application of one bag.  If you look at the image to the right, in the bottom left, you will see that Scotts recommend this 37.5 pound bag will cover 15,000 square feet (ft²).  The How Many Bags for Lawn calculator (CLICK HERE) will tell you how many bags you need.

The formula for the number of bags needed is:

  nB = A / BC

where:

• nB = Number of Bags needed
• A = Area (square footage of yard)
• BC = Bag Coverage (how many square feet per bag)

How big is your yard?

If you know the dimensions of the lawn, you can enter them in one of the calculators listed here to compute the square footage of the lawn.

Size of Land Calculators

• Size of a Rectangle Land
• Size of a Four Sided Land (not square)
• Size of a Five Sided Land

Using Google Maps to Measure Your Lawn

One great tool for measuring the size on a yard is Google Maps.  Find your home, and then right click on the screen.  The last option is "Measure Distance".  If you use this, to outline your yard, you will also get the square feet within the outline in an info box (see image of our yard).  Our yard, indicated 110,138 ft² .  If we want to treat it with, the Fall Lawn Food (above) that covers 15,000 ft² per bag, we enter 110138 ft² (A) in the calculator and 15,000 ft² (BC) in the calculator to find that we need 7.3 bags.  So I'll buy 8 to be safe.

Lawn Calculators

• Time to Mow and Distance Walked Mowing
• How Many Bags for Lawn Treatment or Seeding
• Compute the amount of sod needed for a rectangular area.
• Compute the amount of sod needed for an irregular shaped area.
• Compute how much grass seed is needed to plant new sod in a rectangular area.
• Compute how much straw is needed to cover new grass seed in a rectangular area, 
• Compute how much grass seed is needed to plant new sod in an irregular area.
• Compute how much straw is needed to cover new grass seed in an irregular area.