Roofing Calculator
Estimate roofing materials based on your roof dimensions and pitch. Calculate shingles, underlayment, and accessories.
🏗️ Enter Your Roof Dimensions
6/12 is most common for residential homes
More complex roofs need higher waste factor
Most codes allow max 2 layers
How to Calculate Roofing Materials
Our roofing calculator estimates shingles, underlayment, and accessories based on your building dimensions and roof pitch. Understanding your roof's pitch is key to getting accurate material estimates.
Understanding Roof Pitch
Roof pitch is expressed as a ratio of rise over run. A 6/12 pitch means the roof rises 6 inches for every 12 inches of horizontal run. Steeper pitches require more material because the actual roof surface area is larger than the building footprint.
What is a Roofing Square?
A "square" is 100 square feet of roof area. Shingles are sold in bundles, and it takes 3 bundles to cover 1 square for most standard shingle types.
FAQ
How many squares for a 1,500 sq ft house?
A 1,500 sq ft footprint with a 6/12 pitch needs approximately 17-19 squares (including waste), which translates to about 51-57 bundles of shingles.
How long do shingles last?
3-tab asphalt shingles last 15-20 years. Architectural shingles last 25-30 years. Metal roofing can last 40-70 years. Climate, ventilation, and installation quality all affect lifespan.