Roofing Calculator

Use this roofing calculator to estimate total roof area, shingles or panels, plywood sheets, and total cost for your project.

Related Calculators

Roof Pitch Calculator | Tile Calculator | Concrete Calculator

How to Use

Choose either dimensions with pitch or total roof area, select the material type and cost per bundle, then click calculate. The calculator will provide roof area including waste, number of bundles/panels, required plywood sheets, and total material cost.

Example

For a 30 ft x 40 ft roof with a 6/12 pitch using asphalt shingles at $75 per bundle:
Roof area (with 10% waste): 1368 sq ft

Bundles needed: 42
Plywood sheets: 43
Material cost: $3,150

Tips

• Add 10% waste for cuts and mistakes
• Steeper roofs require more material
• Include overhangs and hips in measurements

Frequently Asked Questions

What is a roofing square?
100 sq ft.

Do I need extra materials?
Yes, usually 5–10% extra for waste.