Calculate roofing square footage from roof length, width, pitch, slope, or known area. Estimate roof squares, shingle bundles, underlayment rolls, drip edge, ridge material, waste, and roofing cost.
Footprint and pitch mode:
The calculator estimates roof area from building footprint and roof pitch factor.
Single roof plane mode:
The calculator multiplies roof plane length by roof plane slope width and the number of roof planes.
Known area mode:
The calculator starts from a known roof area and estimates squares, bundles, rolls, waste, and cost.
Known squares mode:
The calculator starts from roofing squares and converts them to square feet before estimating materials.
A roofing area calculator helps estimate roof square footage for shingles, metal roofing, underlayment, roof coating, sheathing, drip edge, ridge caps, and roofing project planning.
It can help calculate roofing area, roof squares, shingle bundles, underlayment rolls, pitch factor, waste, and estimated roofing cost.
Your result shows roofing area, pitch factor, roof squares, area with waste, estimated shingle bundles, underlayment rolls, ridge length, drip edge length, and estimated cost.
For a rough estimate, multiply the roof footprint by the roof pitch factor. A steeper roof has more surface area than the flat building footprint.
A roofing square equals 100 square feet of roof area. For example, 1,250 square feet is 12.5 roofing squares.
Many asphalt shingles use about 3 bundles per roofing square, but coverage can vary by brand, shingle type, exposure, and product design.
Simple roofs may use around 10% waste. Complex roofs with valleys, hips, dormers, steep pitches, or many cuts may need 15% or more.
No. It is an estimate for planning. Exact roofing area depends on roof shape, slope, overhangs, valleys, hips, dormers, penetrations, starter strips, ridge caps, and installation method.