Roofing Calculator

Estimate shingles, underlayment, and drip edge for common roof projects.
Enter footprint dimensions or draw your roof shape, choose a pitch factor, and apply waste to get a more realistic bundle and accessory count before ordering.

Currency

Roof footprint length (m)Roof footprint width (m)

Roof pitch factorWaste percentage

Estimated roofing materials

45 bundles

Roof area: 124.79 sq m

Area with waste: 1477.5 sq ft (14.78 squares)

Underlayment rolls: 4

Drip edge pieces (10 ft): 16

Cost & Budget Planner

Use your local pricing to turn quantity into a working budget range before calling stores or contractors.

Price per bundle (CAD)Estimated labor (CAD)Contingency (%) (extra buffer for surprises)

Quantity basis: 45.0 shingle bundles

Materials subtotal: CAD $0

Project subtotal: CAD $0

Contingency: CAD $0

Total budget: CAD $0

Planning ranges: DIY CAD $0 to CAD $0 | Contractor CAD $0 to CAD $0

Tips for Roofing Estimates

Confirm local code requirements for underlayment layers.
Steeper roofs need more material than footprint area suggests.
Bundle count varies by shingle type—verify manufacturer specs.

Calculator

For quick arithmetic while measuring (areas, totals)—separate from the paint estimate.

How this estimate is calculated

Roof area: footprint area x pitch factor.
Adjusted area: roof area x (1 + waste %).
Bundles: adjusted squares x 3 bundles per square, rounded up.
Underlayment: adjusted area divided by roll coverage, rounded up.
Cost planning: use your entered material price for each calculated unit (or converted paint package pricing), then add labor and contingency to produce the total budget range.

DIY Learning Hub

Learn installation basics, material selection tips, and common mistakes before you buy.

Learn this project View all guides