Roofing Calculator
Calculate the exact amount of shingles, underlayment, and roofing materials needed for your roof project. Get accurate measurements for roof area, roofing squares, and material costs based on your roof dimensions and pitch.
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.