🏠 Roofing Calculator

Calculate roof area, estimate materials needed, and plan your roofing project efficiently.
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Basic Roof Area Calculator

Simple Gable Roof Area:
Total Area = 2 × (Building Length × Roof Slope Length)
Roof Slope Length = √((Building Width/2)² + Rise²)
W L H S Required: L, W, H Simple Gable Roof
Typical: 10-15% for complex roofs
Format: rise/run (e.g., 4/12)

Advanced Roof Area Calculator

Complex Roof Calculation:
Account for dormers, overhangs, and multiple roof planes
Use individual plane calculations and sum total area
Main Roof Dormer Overhang Complex Roof with Dormer
Main Building
Dormers & Extensions

Roofing Materials Calculator

Material Estimation:
Calculate shingles, underlayment, flashing, and hardware based on roof area
Account for starter strips, ridge caps, and waste factors
Deck Underlayment Shingles Flashing Required: Area, Material Type Roof Layer Structure
Total length of all roof edges

Roofing Cost Estimation

Cost Analysis:
Estimate material and labor costs for roofing project
Includes typical markups and regional variations
Materials Labor Other Materials (60%) Labor (30%) Other (10%) Typical Cost Breakdown
Project Details
Additional Costs
Per sq ft for tear-off
Permits, equipment, etc.

Roofing Materials Reference

Asphalt Shingles

3-Tab Shingles: Standard, 12" x 36" exposure, ~100 sq ft per bundle (3 bundles per square)

Architectural/Dimensional: Thicker, more attractive, ~33.3 sq ft per bundle (3 bundles per square)

Premium: High-end architectural, ~25 sq ft per bundle (4 bundles per square)

Lifespan: 15-30 years | Cost: $80-400 per square

Metal Roofing

Standing Seam: Vertical panels with seams, excellent durability

Corrugated: Wave-pattern panels, economical option

Metal Shingles: Designed to look like traditional shingles

Lifespan: 40-70 years | Cost: $300-800 per square

Tile Roofing

Clay Tile: Traditional, very durable, fire resistant

Concrete Tile: More affordable alternative to clay

Stone-Coated Steel: Lightweight, durable, fire resistant

Lifespan: 50-100 years | Cost: $400-1000+ per square

Underlayment

Felt (15 lb): Traditional, 432 sq ft per roll

Synthetic: Lighter, more tear resistant, 1000 sq ft per roll

Ice & Water Shield: Self-adhering, critical for edges and valleys

Cost: $25-75 per roll

Flashing Materials

Step Flashing: For walls and chimneys, 8" x 8" pieces

Drip Edge: For eaves and rakes, prevents water damage

Valley Flashing: For internal roof angles, 18" wide rolls

Material: Aluminum, galvanized steel, or copper

Installation Notes:
• Always follow local building codes
• Consider regional weather conditions
• Proper ventilation is critical for roof longevity
• Ice dam protection needed in cold climates
• Professional installation recommended for complex roofs

Results

Select a calculation type and enter the required parameters.

Important Notes:
  • These are estimation calculations
  • Consult roofing professional for accurate bids
  • Local codes and weather affect requirements
  • Always add waste factor (10-15%)
  • Consider professional installation for safety
Quick Tips:
  • Measure twice, order once
  • Account for complexity in waste factor
  • Seasonal pricing may vary
  • Get multiple quotes from contractors
  • Check warranty coverage

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