Wall Area Calculator
Calculate a wall's net area after subtracting doors and windows — the figure needed for paint, plaster, or cladding estimates.
- Free to use
- Accurate results
- No registration required
- Works on all devices
Enter your wall's length, height, and combined door/window area to find its net area.
Add up the area of all doors and windows in this wall.
Your result
12
Net wall area
Gross wall area15
AI explanation
Formula
Net area = (length × height) − openings areaWorked example
5m × 3m wall, 3 m² of openings
| Field | Value |
|---|---|
| Wall length (m) | 5 |
| Wall height (m) | 3 |
| Doors/windows area (m²) | 3 |
| Gross wall area | 15 |
| Net wall area | 12 |
Assumptions
- Openings area must be the combined area of all doors and windows in this specific wall — sum them up before entering.
Frequently asked questions
Why do I need the net area instead of just length × height?
You don't paint, plaster, or clad over doors and windows — the net area (after subtracting those openings) is the actual quantity of material you need.
How do I find the combined area of my doors and windows?
Multiply each opening's width by its height, then add all the openings in this wall together before entering the total here.
I need the paint quantity, not just the area — is there a calculator for that?
Yes — see the Paint Calculator, which takes the same inputs and computes paint volume directly.