Roofing Calculator: How to Estimate Your Roof Replacement

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Ready to estimate roofing? Use our Roofing Calculator for professional results.

Roofing is measured in "squares" – one square equals 100 square feet. Let's break it down.

Understanding Roofing Terminology

Roofing Square

1 square = 100 sq ft This is the standard unit for roofing materials.

Bundles

Typically 3 bundles = 1 square

Pitch

Roof pitch is expressed as a ratio (e.g., 4:12 means 4 inches of rise per 12 inches of run).

How to Calculate Your Roof

Step 1: Measure Each Plane

Length × Width = Area of each plane

Step 2: Add Them Up

Total Square Footage = Sum of all planes

Step 3: Convert to Squares

Squares = Total Square Footage ÷ 100

Step 4: Add Waste

Add 10-15% for waste, especially on complex roofs.

Pro tip: Our Roofing Calculator handles all these calculations for you automatically.

Common Roofing Materials

Asphalt Shingles

• Most popular
• $3-$7 per sq ft installed
• 20-30 year lifespan

Metal Roofing

• $8-$20 per sq ft
• 50+ year lifespan
• Energy efficient

Tile Roofing

• $10-$25 per sq ft
• Very durable
• Heavy, needs strong structure

Conclusion

Use our Roofing Calculator to estimate materials for your roof project!