Roofing Calculator – Squares and Materials
Calculate roofing squares needed and shingles for any roof.
About This Calculator
Calculate roofing squares needed and shingles for any roof. Use the calculator above for instant results.
Worked Examples
- Area: 2,000 sq ft + 15% waste = 2,300 sq ft
- = 23 squares | 69 bundles
Answer: 23 squares / 69 bundles
- Area: 600 sq ft + 15% = 690 sq ft = 6.9 squares
Answer: 7 squares
- 40x25ft x 4 sides: 16 squares + waste: 18.4 squares
Answer: 18.4 squares
Who Uses This Calculator?
Estimate shingles for any job.
Understand roofing material quantities.
Bid roofing projects accurately.
Plan roof repair or replacement.
Common Mistakes to Avoid
❌ Forgetting roof pitch factor
A steeper roof covers more actual surface area than its footprint suggests. For steep roofs (>6/12 pitch), add 10-20% more.
❌ Buying exact squares
Always buy 10-15% extra for cuts, waste, ridges, and potential future repairs.
Frequently Asked Questions
What is a roofing square?
100 square feet of roofing. The standard unit for estimating roofing materials.
How many bundles per square?
3 bundles per square for standard 3-tab shingles. Architectural shingles: also ~3 bundles but verify.
Roof lifespan by material?
Asphalt shingles: 20-30 years. Metal: 40-70 years. Tile: 50-100 years. Slate: 75-150 years.