屋顶计算器
计算瓦片、瓷砖或金属屋顶面积
来源与方法
Squares = (Roof Area × Pitch Factor) / 100One roofing square = 100 square feet
How to Use the Roofing Calculator
Calculate roofing squares, shingle bundles, and total coverage area. Our calculator accounts for roof pitch and waste factor to give you accurate material estimates. Start by measuring your roof's footprint using our square footage calculator.
Understanding Roof Pitch
Roof pitch is expressed as rise over run (e.g., 6/12 means 6 inches of rise per 12 inches of horizontal run). Steeper pitches require more material due to increased surface area. We apply the appropriate multiplier automatically.
Squares and Bundles
A roofing "square" covers 100 square feet. Most asphalt shingles require 3 bundles per square. Premium or architectural shingles may require 4-5 bundles per square.
Professional Advice
Roofing is complex and dangerous work. We recommend consulting with a licensed roofing contractor for accurate assessments, especially for:
- Complex roof shapes with multiple valleys and hips
- Steep roofs requiring special safety equipment
- Re-roofing over existing shingles
- Warranty and code compliance requirements
Related Home Exterior Calculators
Complete your home exterior project with our lumber calculator for fascia and soffits, insulation calculator for attic insulation, and paint calculator for trim. Use the loan calculator to finance major roof replacements.
常见问题
Measure roof length x width for each section, sum the areas, then divide by 100 (one square = 100 sq ft). Add 10-15% for waste and starter strips. A 30x40 foot roof = 1,200 sq ft = 12 squares + waste = order 14 squares.
Standard 3-tab shingles come 3 bundles per square (100 sq ft). Architectural/dimensional shingles are heavier and often come 4-5 bundles per square. Always check the coverage listed on the bundle packaging for your specific product.
Measure the vertical rise per 12 inches of horizontal run. A 6/12 pitch rises 6 inches for every 12 inches horizontal. Multiply flat roof area by the pitch factor: 4/12=1.054, 6/12=1.118, 8/12=1.202, 10/12=1.302, 12/12=1.414.
3-tab shingles last 15-20 years. Architectural shingles last 25-30 years. Premium architectural shingles can last 40-50 years. Actual lifespan depends on climate, ventilation, installation quality, and maintenance. Hot climates reduce shingle life.
Most codes allow up to 2 layers of shingles. However, tear-off is recommended to inspect decking for damage, ensure proper installation, and maintain warranty coverage. Adding weight with multiple layers can stress roof structure.
Average roof replacement costs $8,000-$15,000 for asphalt shingles on a typical home. Factors include roof size, pitch (steep = more labor), material choice, tear-off needs, and local labor rates. Get 3+ quotes for accurate pricing.
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