Free calculator
Roofing Square Calculator
Convert roof area into roofing squares, add a waste allowance and estimate the number of shingle bundles to order.
Your project details
Change the inputs below to match your project.
Planning tool only. Verify field measurements, material specifications and project requirements before ordering materials or starting work.
What is a roofing square?
One roofing square equals 100 square feet of roof surface. Contractors and suppliers commonly use squares when discussing roofing quantity.
Why add waste?
Valleys, hips, ridges, starter strips and cuts create waste. Complex roofs can require a larger allowance than simple rectangular roof planes.
From quantity to budget
After estimating squares, use the Roof Replacement Cost Calculator to build a broader replacement budget.