Professional Estimation Tools
Roofing Square Footage Calculator
Calculate your roofing area, squares, and material needs with Milwaukee's most accurate estimator. Built specifically for Wisconsin architectural standards.
Roofing Calculator
Roofing Material
sq ft
feet
$ / sqft
Roofing Estimation
Estimated Roof Area (Sq Ft)
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Estimated Roof Area (Sq M)
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Roof Squares (10% Buffer)
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By United States Standard, The Roof Will Need:
Asphalt Shingle Bundles (~33.3 sqft each)
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Roll Roofing (108 sqft per roll)
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#15 Felt Rolls (~432 sqft each)
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#30 Felt Rolls (~216 sqft each)
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sq ft
Material List (Includes 10% Waste Buffer)
Asphalt Shingle Bundles
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Roll Roofing
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#15 Roofing Felt Rolls
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#30 Roofing Felt Rolls
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Expert Guide
How To Calculate Your Roof Square Footage
Accurate measurements are the foundation of any successful roofing project. Follow these steps to prepare your inputs for the calculator.
1
Measure Footprint
Measure the length and width of your home's ground floor. Multiply them to get the base area. For L-shaped homes, split them into rectangles.
2
Factor in Pitch
The "pitch" is how many inches the roof rises for every 12 inches it runs. A steeper roof has a much larger surface area than a flat one.
3
Account for Eaves
Don't forget the overhang! Most eaves stick out 1 to 2 feet past the walls. Our calculator automatically handles this added dimension.
Material Insights
Why Precise Estimation Matters
Roofing materials are a major investment. Underestimating leads to project delays, while overestimating wastes thousands of dollars.
Shingle Bundles: Most bundles cover 33.3 sq. ft. You need exactly three to cover one "square" (100 sq. ft.).
Felt Underlayment: #30 felt is thicker and more durable than #15, but it covers less area per roll (~216 vs ~432 sq. ft.).
The Waste Buffer: We always include a 10% buffer. This accounts for cutting, trimming, and hip/valley waste.
What is a "Roof Square"?
In the roofing industry, one "square" is equal to 100 square feet. Contractors use this unit to simplify large-scale estimates. For example, a 3,000 sq. ft. roof is described as a "30-square" project.
PRO TIP:
Always round your "Squares" UP to the next whole number when buying materials!
Trust & Credentials
Why Milwaukee Trusts Roofing Pros
Calculators are just the start. Our expert team ensures these measurements are turned into precision-engineered protection for your property.
Fully Licensed & Insured
Peace of mind knowing your property is protected by a fully legitimate, Wisconsin-certified contractor.
BBB A+ Rated Business
The highest rating for business ethics and customer satisfaction in Milwaukee and beyond.
Expert Precision
Our calculators use regional material factors specifically selected for Wisconsin weather durability.
Questions?
Roofing Calculator FAQ
It is highly accurate for standard rectangular or L-shaped roofs. However, if your roof has complex architectural features like multiple dormers, turrets, or varying pitches, we recommend a professional on-site evaluation.
#30 felt is the industry standard for durability and protection. #15 felt is often used as a lighter, more economical option for outbuildings or temporary covers. For Milwaukee winters, #30 is highly recommended.
Our 10% buffer typically covers standard waste and a starter row for simple roofs. If you have extensive eaves and gables, you may want to increase your waste factor to 15%.
Cool roofs (often TPO or PVC) are designed to reflect more sunlight and absorb less heat than a standard shingles roof, significantly reducing energy costs for commercial buildings.