What it calculates
Estimate roof area, squares and bundles.
Roofing Calculator
Estimate roof area, roofing squares and shingle bundles from footprint and pitch factor.
Planning and estimating aid only. Verify project requirements, manufacturer instructions, adopted codes, permits, and field conditions before performing regulated work.
Construction estimating
How to Use This Calculator
Enter the measurements and job information you know, select Calculate, then use the result as a starting point for estimating, purchasing or project planning.
How the calculation works
Footprint area is multiplied by the entered pitch/complexity factor and waste, then divided by 100 for roofing squares.
What the result means
Use measured roof-plane area when available; hips, valleys and complex roofs generally increase waste.
Use real project measurements
Start with the actual field dimensions or equipment values from the job. Run the calculator once with your measured quantity, then test a second scenario with your normal waste, routing or safety allowance. This makes the tool useful for both the takeoff and the customer estimate.
Contractor tip: Save the measurements that produced your estimate in the job notes so the quantity can be checked later if the scope changes.
Verify the final quantity
Field dimensions, material sizes, spans, structural requirements and waste vary by project. Verify measurements, plans, specifications and applicable code before ordering or building.
Good practice: Compare the calculated quantity with plans, specifications, product packaging and current field conditions before purchasing material.