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Calculate roofing materials needed including squares, bundles, underlayment, and costs for any roof size and pitch.
A roof replacement is one of the most significant home improvement investments. Accurately calculating materials before you buy ensures you get the right amount and helps you compare contractor quotes. Our roofing calculator handles the math -- accounting for pitch, material type, and waste.
The easiest way to measure your roof is from the ground. Measure the length and width of your home footprint (including overhangs). Our calculator then applies a pitch multiplier to convert the flat footprint into actual sloped roof area. If you have access to your roof or attic, direct measurements are more accurate, especially for complex shapes.
Roof pitch is expressed as rise over run -- for example, 6/12 means the roof rises 6 inches for every 12 inches of horizontal distance. Common residential pitches range from 4/12 to 8/12. Steeper pitches shed water faster but require more material and are harder to work on. Your pitch determines the multiplier applied to your footprint to get true roof area.
Asphalt shingles (3-tab and architectural) dominate the US market due to low cost and easy installation. Architectural shingles offer better wind resistance and a dimensional look. Metal roofing (standing seam or corrugated) lasts 40-70 years and reflects heat, lowering cooling costs. Wood shakes provide a natural look but require more maintenance. Slate is the premium option lasting 100+ years.
Every roof needs an underlayment layer between the decking and the shingles. Synthetic underlayment ($50-75 per roll covering 400 sq ft) is replacing traditional felt paper. You also need drip edge along eaves and rakes, ridge cap for the peak, flashing around penetrations, and roofing nails (approximately 2.5 lbs per roofing square).
Roofing is physically demanding and dangerous work. Most homeowners hire professionals, and the labor cost is well justified by warranty coverage and safety. However, small repairs and shed roofs are reasonable DIY projects. Always check local building codes -- many jurisdictions require permits for roof replacement.
Pro includes printable materials lists with shingle bundles, underlayment, flashing, and ridge caps.
A roofing square is a unit of measurement equal to 100 square feet of roof area. It is the standard unit used by roofers and suppliers. For example, a 2,000 sq ft roof is 20 roofing squares.
For standard 3-tab and architectural asphalt shingles, 3 bundles make one square (100 sq ft). Wood shakes typically require 4 bundles per square. Metal and slate roofing are sold differently (by the panel or per piece).
Steeper roofs have more surface area than the footprint suggests. A 6/12 pitch adds about 12% more area, while a 12/12 (45-degree) pitch adds 41%. Our calculator uses standard pitch multipliers to convert footprint area to actual roof area.
Materials for an average 2,000 sq ft roof cost $2,400-$5,000 for asphalt shingles, $6,000-$12,000 for metal, and $16,000+ for slate. Labor adds $3,000-$8,000. Total installed cost ranges from $6,000-$25,000+ depending on material and complexity.
Plan for 10-15% waste on simple gable roofs and 15-20% on complex roofs with hips, valleys, and dormers. Each valley, ridge, and penetration (vents, skylights) creates more waste from cuts.
Roofing Calculator is part of BriskTool's collection of free online tools. All processing runs entirely in your browser for maximum privacy and speed.