Roofing Calculator

Calculate roofing materials and estimate costs for your project.

Roof Dimensions

Length

Width

Unit

Roof Pitch

Rise per 12 inches of run

Understanding Roofing Terms

Square: 100 square feet of roof area. Used to order materials.
Pitch: The slope of the roof, expressed as rise:run (e.g., 4:12 means 4 inches rise per 12 inches horizontal).
Bundle: Standard shingle packaging. 3 bundles typically cover 1 square.

Roof Pitch Multipliers

3:12×1.03

4:12×1.05

5:12×1.08

6:12×1.12

8:12×1.2

10:12×1.3

12:12×1.41

Multiply footprint area by this factor to get actual roof area.

Roof Area

Total Roof Area1,265 sq ft

Roofing Squares12.65

Materials Needed

Shingle Bundles42

Underlayment Rolls4

Ridge Cap Bundles12

Roofing Nails~4,048

Cost Estimate

Installation Cost$1,581