Free · Everyday · Construction

Roofing Calculator

Estimate sloped roof area, roofing squares, bundles, and waste from plan dimensions and roof pitch.

  • Checked formula
  • Private in your browser
  • No signup
Calculator inputs

Enter your values

Result

Your calculation

Roof area with waste
1,377 ft²
Roofing squares
13.77
Three-bundle squares
42 bundles
Slope multiplier
1.118

Complex roofs require separate planes and allowances for hips, valleys, ridges, openings, and local installation rules.

How to use this calculator

  1. Enter the values and choose the units that match your situation.
  2. Calculate to see the primary answer and useful conversions.
  3. Review the assumptions before using the result for a project or decision.

Private by default

Inputs and results stay in this browser tab. Bookify does not upload or store the values you enter.