Roof Shingle Calculator
Calculate shingle bundles, materials, and costs for your roofing project with accurate measurements
Roof Dimensions
Length of the roof at the base
Width of the roof at the base
Roof Area Results
Formula: Roof Area = (Length × Width) × Pitch Multiplier
Calculation: (0 × 0) × 1.1180 = 0.0 feet²
Shingle Requirements
Typical: 33.3 sq ft per bundle
Standard: 29 shingles per bundle
Shingle Requirements
Formula: Bundles = (Roof Area / Bundle Coverage) × (1 + Waste %)
Calculation: (0.0 / 33.3) × 1.10 = 0 bundles
Note: 1 Square = 100 sq ft, Standard bundle covers 33.3 sq ft (3 bundles per square)
Example Calculation
Standard House Roof
Roof Dimensions: 40 ft × 30 ft
Footprint Area: 1,200 sq ft
Roof Pitch: 6:12 (26.6°)
Pitch Multiplier: 1.118
Calculation Steps
1. Roof Area = 1,200 sq ft × 1.118 = 1,342 sq ft
2. Roof Squares = 1,342 ÷ 100 = 13.42 squares
3. Base Bundles = 1,342 ÷ 33.3 = 40.3 bundles
4. With 10% waste = 40.3 × 1.1 = 44.3 → 45 bundles
5. Total Shingles = 45 × 29 = 1,305 shingles
Shingle Types
Asphalt Shingles
Most popular, affordable, 20-30 year lifespan
$100-$200 per square
Architectural Shingles
Dimensional, premium look, 25-40 years
$150-$300 per square
Wood Shingles
Natural cedar, 25-30 years
$300-$500 per square
Metal Shingles
Durable, energy efficient, 40-70 years
$400-$800 per square
Common Roof Pitches
Installation Tips
Order 10-15% extra for waste and future repairs
Check local building codes before starting
Install underlayment before shingles
Start from bottom edge and work up
Use proper nail placement and spacing
Consider professional installation for safety
Understanding Roof Shingle Calculations
What Are Roof Squares?
A "square" is a standard unit in roofing that equals 100 square feet of roof area. This unit simplifies material calculations and pricing, as most roofing materials are sold per square.
Why Accurate Calculation Matters
- •Prevents material shortages during installation
- •Avoids costly overordering and waste
- •Ensures proper project budgeting
- •Helps plan delivery and storage logistics
Calculation Components
Bundles = (Roof Area / Bundle Coverage) × (1 + Waste %)
Standard: 3 bundles per square (33.3 sq ft coverage each)
- Roof Area: Footprint × pitch multiplier
- Pitch Multiplier: √(1 + (rise/run)²)
- Bundle Coverage: Typically 33.3 sq ft
- Waste Factor: 10-25% depending on complexity
Safety Note: Roofing work is dangerous. Consider hiring professional contractors for installation, especially on steep or complex roofs.