Back to Everyday Calculators

Roofing Calculator

Calculate roof area, material requirements, and cost for your roofing project.

Estimated Roof Area
0
square feet
Or 0 sq meters
Or 0 sq yards
Materials needed (with 10% buffer):

Roofing Calculator Guide

How the Calculator Works

This calculator estimates the total roof surface area based on the house base area, roof pitch, and eaves overhang. It then calculates the amount of roofing materials needed, including a 10% buffer for waste and cutting.

Key Formulas

Roof Slope Factor = √(1 + (Pitch/12)²)
Roof Area = Base Area × Slope Factor + Eaves Adjustment

Material Estimation

  • Shingles: Bundles needed (1 bundle ≈ 33 sq ft)
  • Roll Roofing: Rolls needed
  • Felt Underlayment: Rolls of #15 or #30 felt

Tips for Roofing Projects

  • Always add 10-15% extra material for waste and errors.
  • Consider roof complexity (valleys, hips, dormers) which may require more material.
  • Consult with a professional roofer for accurate estimates and safety.