Roofing Calculator
Calculate roofing materials for your project
How to Use the Roofing Calculator
- Measure roof dimensions: Enter the length and width of your roof in feet.
- Determine roof pitch: Measure the rise over 12 inches of run (e.g., 6/12 pitch).
- Select roofing material: Choose from asphalt shingles, architectural shingles, metal, or clay tiles.
- Review calculations: Get roof area in square feet, number of squares needed, and material costs.
- Plan your project: Use results to order materials and estimate project timeline.
Understanding Roof Pitch
How to Measure Roof Pitch
- • Use a level and measuring tape
- • Measure 12 inches horizontally from the roof edge
- • Measure vertically from that point to the roof
- • Express as rise/run (e.g., 6/12 or 6:12)
- • Can also be expressed in degrees or percentage
Common Roof Pitches
Roofing Material Types & Costs
| Material Type | Lifespan | Cost/Square | Best For |
|---|---|---|---|
| Asphalt Shingles | 15-30 years | $300-$500 | Budget-friendly, easy installation |
| Architectural Shingles | 25-40 years | $400-$700 | Enhanced appearance, better durability |
| Metal Roofing | 40-70 years | $700-$1200 | Longevity, energy efficiency |
| Clay/Concrete Tiles | 50-100 years | $500-$1000 | Durability, fire resistance |
Understanding Roofing Squares
A "roofing square" is a standard unit of measurement in the roofing industry that equals 100 square feet of roof area. This measurement helps standardize material calculations and pricing across the industry.
Example Calculation:
A roof that measures 30 feet × 40 feet = 1,200 sq ft
1,200 sq ft ÷ 100 = 12 roofing squares
Why Use Squares?
- Simplifies material ordering and cost estimation
- Standard packaging often corresponds to square coverage
- Makes it easier to compare contractor bids
- Accounts for roof pitch in area calculations
Roofing Installation Tips
Safety First
- • Always use proper safety equipment
- • Work with a partner when possible
- • Avoid working in wet or windy conditions
- • Use roof brackets and safety harnesses
- • Check local building codes and permits
Installation Best Practices
- • Start from the bottom and work up
- • Ensure proper shingle overlap
- • Install underlayment for extra protection
- • Use appropriate nails and fasteners
- • Plan for proper ventilation
Related Construction Calculators
Frequently Asked Questions
How do I measure roof pitch safely?
You can measure pitch from inside the attic using a level and measuring tape, or hire a professional for exterior measurements.
How many bundles of shingles are in a square?
Typically 3 bundles equal one square (100 sq ft) for standard asphalt shingles. Architectural shingles may vary.
Should I include waste in my calculations?
Yes, add 10-15% for waste, cuts, and starter strips. Complex roofs with many angles may need up to 20% waste factor.
What other materials do I need besides shingles?
You'll also need underlayment, starter strips, ridge caps, drip edge, flashing, and roofing nails or fasteners.