Roof Size Calculator
Convert footprint + pitch into roof squares (with waste planning).
Use roof squares for planning—not final ordering
This roof size calculator estimates slope area from the footprint and pitch. Real Utah roofing estimates may change for multiple roof planes, valleys, hips, dormers, skylights, overhangs, tear-off layers, and decking repairs. Verify measurements before ordering materials or comparing replacement bids.
How to use this calculator
Fullstack Roofing Team here—follow these steps to get a solid estimate:
- Measure the house footprint length + width (ground dimensions).
- Enter pitch as rise/12 (example: 6 for 6/12).
- Pick a waste allowance for complexity.
- Use the result as a planning estimate—confirm with a pro measurement for ordering.
If you don’t know pitch, use the Roof Pitch Calculator, then come back.
Don’t know pitch? Use Roof Pitch Calculator.
Waste varies by valleys, hips, dormers, skylights, and cut-up roofs.
Fullstack Roofing coordinates roofing projects with licensed contractor partners. Terms of Service
Enter length and width to calculate roof size.