Roofing Calculator

Roofing Calculator is a free online tool for homeowners and contractors to plan a roofing project before buying materials.
Enter your roof dimensions and pitch to instantly estimate area, the number of shingles or panels, underlayment, and total cost.
Users can:
- Calculate roof pitch and slope from rise and run
- Convert between pitch, angle, and slope factor
- Estimate total roof area and squares
- Work out shingle bundles, materials, and waste
- Get a ballpark roofing cost based on current price ranges
Built for quick, accurate estimates with no signup.
Works for gable, hip, and complex roofs on any device.