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Wall Area Calculator with Door & Window Deductions

Your walls and openings

Enter your details below

Measure the wallsUse decimal feet or meters; all walls use the same height

Measurement units

Changing units reinterprets the numbers. Enter 12 ft 6 in as 12.5 ft; one measurement system throughout.

Measure using

Room length (ft)

Room width (ft)

Total wall length (ft)

Add only the wall faces you need. For irregular rooms, sum the actual measured wall lengths.

Wall height (ft)

For different heights or sloping walls, calculate separate sections and add their measured areas.

Subtract measured openingsChoose identical sizes or combined measured areas

Opening measurements

Sizes assumes identical openings within each type. For mixed sizes, add measured areas and use combined areas. Never deduct an opening twice.

DoorsIn size mode, zero doors ignores their width and height

Number of doors

Each door width (ft)

Each door height (ft)

Combined door area (sq ft)

Total measured area of all doors to subtract, already summed; no count multiplier in this mode.

WindowsIn size mode, zero windows ignores their width and height

Number of windows

Each window width (ft)

Each window height (ft)

Combined window area (sq ft)

Total measured area of all windows to subtract, already summed; enter zero for none.

Material estimate (optional)Allowance and unit price are editable planning inputs

Extra material allowance

Zero gives measured net area. Any allowance depends on product, layout and supplier; 10% in a worked example is not a recommendation.

Material price per area unit

Price is per

Results update automatically

Your result

Based on the values you enter

Net wall area Enter values to calculate.

Your result explanation will appear here.

One wall face at a common height. Openings must not overlap. Allowance affects material coverage, not measured wall area. No ceiling, reveals, sheet/roll/gallon yield or pack rounding.