Calculate the net paintable or plasterable wall area after deducting doors and windows - useful for the Paint Calculator, Sand Calculator, or ordering materials accurately.
Doors
Windows
How to Use the Wall Area Calculator
Enter the "Wall Length", "Wall Height", and "Number of Walls" (if they're identical).
Enter the "Number of Doors" and their width/height - defaults are for a standard door.
Enter the "Number of Windows" and their width/height - defaults are for a standard window.
Click "Calculate Wall Area" to see the gross area, total deductions, and net paintable/plasterable area.
Frequently Asked Questions
Doors and windows aren't painted or plastered the same way as the wall surface, so subtracting their area gives you a more accurate estimate of materials needed - over-ordering paint or plaster wastes money.
This calculator assumes identical walls for simplicity. For rooms with different wall sizes, calculate each wall separately and add the net areas together.
Yes, if a wall has no doors or windows, just leave those counts at 0 and the calculator will use the gross area as the net area.
Yes, it's completely free and requires no sign-up.