KCalc.Wall Area Calculator
Use this wall area calculator to estimate wall surface area for paint, plaster, or drywall.
Formula: 2 x (Length + Width) x Height
Example
Formula: 2 x (Length + Width) x Height = 2 x (5 m + 4 m) x 2.8 m = 50.40 m2
Enter room length, width, and height in any unit, then choose a result unit (m2 or ft2).
Tip: Choose your result unit on the right before calculating.
Step-by-step calculation
- Enter room length, width, and height with units.
- Select the result unit you want (m2 or ft2).
- Calculate to see wall area and steps in the selected unit.
FAQ
- Do I subtract doors/windows?
- For paint, subtract large openings for accuracy.
- Why use perimeter?
- It accounts for all walls in a rectangular room.