Q:

# How do you calculate how many shingles are needed for your building project?

A:

Professional roofing contractors typically provide estimates of materials needed for roofing, including the number of shingles needed. Simple geometric calculations can provide a rough estimate.

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1. ### Calculate the square footage of the roof

Multiple the length times width for every flat surface on your roof, including dormers. Add together all the totals to get the total square footage.

2. ### Divide the square footage by 100

Shingles are sold in "squares," which are 100 square foot sections of roofing. Unless you are applying shingles directly to an already existing asphalt roof, you probably also need the same amount of underlayment. Divide the roof's total square footage by 100 to determine the number of squares of shingles needed.

3. ### Add an extra 10 percent

Add 10 percent to your total to make sure you have enough shingles for trim.

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## Related Questions

• A:

A roofing estimate calculator is an online tool for calculating the cost of roofing based on building height, dimensions, slope and roofing material. The calculator can be used to estimate the cost for flat, metal and asphalt installations. It can estimate the cost for new installations or making repairs.

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• A:

Roofing estimates are determined by the cost of materials, how accessible the roof is, the size of the roof and its pitch. Before hiring a roofing contractor or company, one should first check to make sure the contractor or company is currently licensed and insured.

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• A:

The weight of a bundle of shingles depends on the weight of the shingles themselves, but for asphalt shingles is generally between 60 and 80 pounds. A bundle of shingles is packaged to be light enough to carry.