Home Calculators Construction Roofing Calculator

Roofing Calculator

Calculate shingles, underlayment, nails, and other materials needed for roof replacement. Estimate costs for different roofing materials.

Calculate Roofing Materials

Enter roof dimensions and select materials to calculate requirements.

Roof Dimensions

Roofing Materials

Roofing Materials Estimate

Total Roof Area
Including pitch factor
-
Roofing Squares
-
Bundles of Shingles
-

Materials Breakdown

🧱
Shingles
- bundles
📦
Underlayment
- rolls
🔨
Roofing Nails
- lbs
🏔️
Ridge Cap
- linear ft
💧
Drip Edge
- linear ft
🔄
Starter Shingles
- bundles

Cost Estimate

Materials Cost
-
Labor Cost
-
Total Estimated Cost
-

Roofing Tips

  • Order 10-15% extra materials for waste and future repairs
  • Check local building codes for underlayment requirements
  • Consider ventilation requirements when replacing roof
  • Get multiple quotes from licensed roofing contractors

Roofing Tips

  • 🌧️

    Weather Considerations

    Plan roofing projects for dry weather. Temperatures affect shingle adhesion.

  • 📐

    Proper Measurement

    Measure each roof plane separately for accuracy. Don't forget valleys and hips.

  • 🔨

    Nail Placement

    Use 4-6 nails per shingle. Follow manufacturer specifications for placement.

  • 🔄

    Layering

    Shingles can typically be installed over one existing layer. More requires tear-off.

Related Calculators

Roofing Types

Asphalt Shingles
Most common, cost-effective, 20-30 year lifespan
Metal Roofing
Durable, energy-efficient, 40-70 year lifespan
Tile Roofing
Heavy, durable, 50-100 year lifespan
Wood Shakes
Natural look, requires maintenance, 30 year lifespan

Complete Guide to Roofing Calculations

Accurate roofing calculations are essential for ordering the right amount of materials and budgeting for your project. This guide explains how roofing measurements work and what factors affect material requirements.

Understanding Roofing Squares

In roofing, area is measured in "squares." One square equals 100 square feet of roof area.

Roofing Squares = Total Roof Area (sq ft) ÷ 100

Example: 2,000 sq ft roof = 20 squares

Pitch Factor Calculation

Roof pitch increases the surface area compared to the flat footprint. Use these multipliers:

Pitch (rise/run) Description Multiplier Angle
0/12 Flat 1.00 0°
3/12 Low slope 1.03 14°
6/12 Medium 1.12 26.6°
9/12 Steep 1.25 36.9°
12/12 Very steep 1.41 45°

Material Coverage Guidelines

Material Coverage per Bundle/Square Bundles per Square Weight per Square
3-Tab Shingles 33.3 sq ft per bundle 3 bundles 240-280 lbs
Architectural Shingles 33.3 sq ft per bundle 3-4 bundles 300-400 lbs
Metal Roofing Varies by panel width N/A 50-150 lbs
Underlayment (#30) 400 sq ft per roll N/A 60-75 lbs per roll

Cost Factors for Roof Replacement

🏠 Roof Size & Complexity

Larger roofs cost more. Complex roofs with multiple valleys, dormers, and steep pitches increase labor costs.

🧱 Material Choice

Asphalt shingles: $100-200 per square. Metal: $150-600 per square. Tile: $300-1000 per square.

🔨 Labor Costs

Typically $100-300 per square. Depends on location, roof complexity, and contractor experience.

🗑️ Tear-off & Disposal

Removing old roofing: $50-150 per square. Dump fees: $100-500 depending on material weight.

Frequently Asked Questions

How many bundles of shingles per square?
Most asphalt shingles require 3 bundles per square (100 sq ft). Some thicker architectural shingles require 4 bundles. Always check manufacturer specifications.
How much waste factor should I include?
Simple roofs: 5-10%. Medium complexity: 10-15%. Complex roofs: 15-20%. Waste accounts for cutting, starter courses, ridge cap, and errors.