Roofing Calculator

Calculate roofing materials needed including shingles, roof area, waste factor, and total cost estimation for your roofing project.

Roofing Calculator
Calculate roofing materials, costs, and project estimates

Roofing Guide

Roof Measurements:

  • • 1 roofing square = 100 sq ft
  • • Measure length × width for each section
  • • Account for roof pitch/slope
  • • Add measurements for all roof sections

Waste Factors:

  • • Simple roof: 10% waste
  • • Complex roof: 15-20% waste
  • • Hip roof: 15% waste
  • • Cut-up roof: 20-25% waste

Shingle Types:

  • • 3-tab shingles: 3 bundles per square
  • • Architectural: 3-4 bundles per square
  • • Premium: 4-5 bundles per square

Additional Materials:

  • • Underlayment: 1 roll per 2-4 squares
  • • Ridge cap: 1 bundle per 35 linear feet
  • • Starter strip: 1 bundle per 100 linear feet
  • • Flashing for valleys and penetrations