Overview
What Is a Roofing Calculator?
This tool calculates your roof area in 'roofing squares' (100 sq ft units), the standard unit roofers use to order materials.
Estimate roofing materials needed for your project.
This tool calculates your roof area in 'roofing squares' (100 sq ft units), the standard unit roofers use to order materials.
Useful for estimating roofing material needs and getting a rough project cost sense.
Input the length and width of your roof surface.
Account for roof slope if applicable.
The result updates automatically.
100 square feet - the standard unit roofers use for material calculations and ordering.
10-15% extra is commonly recommended to account for waste, cuts, and complex roof features.
Yes, steeper roofs have more actual surface area than their flat footprint - a pitch factor should be applied for accuracy.
Related but different unit - divide your square footage by 100 to get roofing squares.
Yes, for actual material ordering, a professional roof measurement is recommended for accuracy, especially on complex roofs.
This estimates the base area - shingles, underlayment, and other materials would each need to be calculated based on this area.
No, calculations happen entirely in your browser.
Calculate each section separately and add the roofing squares together.
No, this is a basic area calculation - complex roof features typically need additional material beyond the base calculation.
Yes, completely free with no sign-up required.