Wall Area Calculator
Calculate gross and net wall area, opening deductions, room perimeter, ceiling area, order allowance and area-based project cost.
Default project preview
381 ft²
Gross wall area
432 ft²
Opening deductions
51 ft²
Order area
419.1 ft²
Wall perimeter
54 ft
Calculator
Build the material order
Your order will appear here
Enter the project details and calculate a rounded material estimate.
Methodology
Transparent calculation
BuildMeter converts every input to a consistent internal unit, applies the selected allowance, and rounds products up to whole purchasable units.
Gross wall area = room perimeter × height × room count. Net area subtracts doors and windows. Order area applies the selected allowance.
BuildMeter Guides
Understand the measurements and assumptions
Use these visible reference guides before changing project inputs or planning allowances.
FAQ
Wall Area Calculator questions
Should door and window openings be deducted?+
Large openings can be deducted, although trim, reveals and cutting waste may partly offset the reduction.
Is ceiling area included in the wall total?+
No. Ceiling area is reported separately.
Can this estimate paint or drywall?+
The area can be used as an input to the dedicated paint, drywall or finish calculators.