Roofing Calculator
Calculate roof area, materials needed (shingles, underlayment), and total cost based on roof dimensions and pitch. Compare different roofing options and estimate your project requirements.
Your Results
| Roof Area | 0 sq ft |
|---|---|
| Roof Pitch Multiplier | 1.0 |
| Surface Area (including pitch) | 0 sq ft |
| Bundles of Shingles Needed | 0 |
| Rolls of Underlayment Needed | 0 |
| Estimated Material Cost | $0.00 |
Material Details:
| Material | Quantity | Cost |
|---|---|---|
| Shingles | 0 bundles | $0.00 |
| Underlayment | 0 rolls | $0.00 |
| Roofing Nails | 0 lbs | $0.00 |
| Drip Edge | 0 ft | $0.00 |
| Ice & Water Shield | 0 sq ft | $0.00 |
| Total Estimated Cost | $0.00 |
About Roofing Calculator
This roofing calculator helps you estimate the materials needed for your roofing project, including shingles, underlayment, and other roofing components. It calculates based on your roof dimensions, pitch, and selected materials.
How Roof Area is Calculated
The calculator first determines the base area of your roof by multiplying length by width. For pitched roofs, it then applies a pitch multiplier to account for the increased surface area:
- Flat (0/12): Multiplier = 1.0
- Low Slope (2/12): Multiplier ≈ 1.014
- Conventional (4/12): Multiplier ≈ 1.054
- Steep Slope (6/12): Multiplier ≈ 1.118
- Very Steep (8/12): Multiplier ≈ 1.202
- Extreme Slope (10/12): Multiplier ≈ 1.302
- Very Extreme (12/12): Multiplier ≈ 1.414
Material Calculations
The calculator estimates materials based on standard coverage rates:
- Shingles: 1 bundle typically covers 33.3 sq ft (3 bundles per square = 100 sq ft)
- Underlayment: 1 roll typically covers 400 sq ft (for #15 felt) or 200 sq ft (for synthetic)
- Roofing Nails: Approximately 1 lb per square (100 sq ft)
- Drip Edge: Linear feet along roof edges
- Ice & Water Shield: Typically 3-6 feet along eaves in cold climates
Cost Estimates
Cost estimates are based on average material prices:
- 3-Tab Shingles: $90-$120 per square (100 sq ft)
- Architectural Shingles: $120-$180 per square
- Premium Shingles: $180-$300 per square
- Metal Roofing: $150-$600 per square
- Tile Roofing: $300-$1000 per square
- Underlayment: $20-$80 per roll
- Nails: $5-$10 per pound
- Drip Edge: $1-$3 per linear foot
- Ice & Water Shield: $0.50-$1.50 per sq ft
Note: These are material costs only and don't include labor or other construction costs. Actual prices may vary based on location and market conditions.