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You need three dimensions to find the number of needed shingles for your roof: Measure the length of the roof at the base of the roof. Measure the width of the roof, again at the base of the roof. Determine the roof pitch, which is the steepness of a roof. Use the roof shingle calculator to complete the estimations.
The first step in estimating the cost of a new shingle roof is figuring out the size of your roof and how many shingles you need. With accurate roof measurements, you can use a roofing calculator or a few simple formulas to determine how many squares of shingles you’ll need.
How Many Shingles In A Square? For regular 3-tab, non-laminated shingles, you’ll have around 78 shingles per square. Some older styles of 3-tab shingles will have up to 87 shingles per square. Architectural shingles will have anywhere from 57 to 66 shingles per square.
This roofing calculator will help you calculate shingles for your project and find the total number you’ll need to cover your roof, including an overage of about 10%. It also covers how many squares you’ll need and how many bundles of shingles you’ll want to buy for your project.
Step 3: Determine Bundles per Square. Most standard three-tab shingle bundles cover about one-third of a square (roughly 33 square feet), meaning three bundles are typically needed per square. However, thicker, premium shingles (like architectural or dimensional shingles) often require four or more bundles per square.
Calculate your roof’s size and estimate how many bundles of shingles, rolls of felt, and squares of roofing material you need for a new roof. Add the price per square for materials to get an estimated material cost.
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