Roofing Squares Calculator
Calculate a simple roofing quantity from your measurements. Review units, selected allowances and scope limits before using the result.
Roofing Squares
Starting values are illustrative. Replace them with your drawing measurements and selected allowances.
Calculated quantity
Formula: Measured roof area ÷ 100 × (1 + allowance ÷ 100)
One roofing square is 100 SF. Enter actual roof-plane area. Excludes flashing, penetrations, laps and installation labor. This is a quantity calculation; it does not supply a price, labor estimate or design approval.
For a drawing-based bid package, review the roofing estimating scope. Identify the current plan issue, included assemblies and required quantity or priced output. Confirm rates, exclusions and revisions separately from this planning calculation.
Prepare the Inputs
Use dimensions from the current drawing revision and match the units shown beside each field. Replace every illustrative starting value with your project inputs. The allowance is entered by you; there is no automatic industry-wide waste factor.
Review the Result
This tool calculates the displayed quantity only. It does not create a complete takeoff, price materials, calculate labor or approve a construction design. Measure different systems and assemblies separately and reconcile details that sit outside the formula.
Download a blank roofing quantity schedule, review roofing estimating scope or request a project quote.