Construction calculator
Roofing Calculator
Estimate sloped roof area, roofing squares, and shingle bundles from a rectangular footprint and pitch multiplier.
Roof materials
Roofing Calculator
Roofing bundles
45
14.78 roofing squares including extra.
Footprint
1,200 sq ft
Length x width
Sloped roof area
1,344 sq ft
Footprint x pitch multiplier
Order area
1,478.4 sq ft
Includes extra allowance
Common Tools Used for Project Measurements
Project calculators usually need room dimensions, surface area, package coverage, or product label values.
Tape measure
Laser distance measurer
Level
Product coverage label
Notebook or floor plan
Keep measurements in one unit while entering values, then use the result as a planning estimate.
Formula
roofing squares = footprint x pitch multiplier x allowance / 100
Measure each roof plane for complex roofs. Valleys, hips, ridges, dormers, starter strips, underlayment, flashing, and local code are not included.
Common Examples
| Input | Estimate |
|---|---|
| 40 ft x 30 ft footprint | 1,200 sq ft |
| 1.12 pitch multiplier | Approximate moderate slope |
| 3 bundles per square | Common asphalt-shingle estimate |