Roofing Calculator
Estimate shingles, underlayment, and roofing costs
Length of the roof base
Width of the roof base
Rise per 12" run (e.g., 6 for 6/12)
Base Area
—
sq ft
Actual Roof Area
—
sq ft
Roofing Squares
—
squares
Shingle Bundles
—
bundles
Estimated Cost
—
USD
How to Use This Calculator
Planning a roofing project? Accurate material estimates prevent costly over-ordering. Our calculator accounts for roof pitch to give you true surface area.
- Measure the length and width of your roof at the base
- Determine your roof pitch
- Enter dimensions in the calculator
- Add 10-15% for waste, valleys, and ridges
AI Insights
Smart analysis for your project
Smart Estimates
Our AI cross-references material costs, regional pricing, and project complexity for more accurate estimates.
Waste Optimization
AI-calculated waste factors based on project type, not flat percentages. Saves 5-15% on material costs.
Best Practices
Recommendations derived from building codes, contractor data, and thousands of completed projects.
Calculation Formula
Pitch factor = sqrt(pitch^2 + 144) / 12
Roof area = Base area x Pitch factor
Squares = Roof area / 100
Bundles = Squares x 3
Frequently Asked Questions
How many bundles of shingles do I need?
You need 3 bundles of standard 3-tab shingles per roofing square (100 sq ft). For architectural shingles, you may need 4 bundles per square.
What is a roofing square?
A roofing square equals 100 square feet of roof area, the standard unit for measuring and pricing.
How much does a new roof cost?
Average roof replacement costs $5,000-$12,000 for asphalt shingles, $12,000-$25,000 for metal, and $20,000+ for slate or tile.