Most artificial grasses come in 12 and 15 ft. wide rolls. The length of rolls can max 100ft. but is usually shorter, as it gets too heavy to carry it.
You can easily calculate the square footage of artificial grass that you need.
Walk feet to feet in two directions and multiply dimension for rectangles. If the shape of your lawn is not perfect, think of a rectangle as you will have to purchase more material. Look for the areas where you can use large pieces cut from other sides of your future artificial grass lawn.
A mid size car takes about 80 square feet of space. Imagine, how many cars you can park on your lawn. Roll width is approximately same as two cars parked alongside. You can be pretty accurate with this approach. It works best on the phone.
Invite a professional artificial grass installer for an estimate. Most companies will do it absolutely free. Know that estimates may vary. The amount of grass claimed in the estimate may not be enough to complete installation if you cut the grass differently from what was in estimator’s mind.
Try to choose estimator that mentions not only the area, but also the amount of material that shall be delivered.
Important to mention
As a rule of thumb, material costs less than quality labor. Therefore, an honest artificial grass installer shall is motivated to provide more material to minimize the amount of seams. Dishonest installer may purchase less material and then try to save every penny on labor.
Lengthy rectangular and uneven shapes require more labor and usually cost more per square foot to install artificial grass.