This tool helps you easily calculate the total area of your walls for painting or tiling projects.

**How to use the Wall Area Calculator:**

1. Enter the height and width of the wall in meters.

2. Enter the number of doors and windows on the wall.

3. Click the “Calculate” button to get the net wall area in square meters.

**Explanation:**

The calculator computes the area of the wall by multiplying its height and width. It then subtracts the combined area of the doors and windows. The formula is as follows:

Net Wall Area = (Wall Height * Wall Width) – (Number of Doors * Average Door Area) – (Number of Windows * Average Window Area)

The average door area is taken as 2.1m by 0.9m, and the average window area is taken as 1.5m by 1.2m.

**Limitations:**

1. The calculator assumes average sizes for doors and windows, which may not be accurate for all cases.

2. You are required to enter non-negative values for height, width, number of doors, and number of windows.

3. The combined area of doors and windows should not exceed the wall area.

## Use Cases for This Calculator

### Calculating Paint Needed for a Wall

To determine how much paint you’ll need to purchase for a wall, simply input the wall’s height and width into the calculator. The tool will instantly provide you with the total square footage to paint the wall, making your shopping trip for the perfect shade of paint a breeze!

### Estimating Wallpaper Rolls Required

If you’re planning to wallpaper a wall, input the wall’s dimensions along with the wallpaper’s width and length pattern repeat. The calculator will then calculate the number of rolls needed, helping you avoid over or underestimating and ensuring a seamless wallpapering project.

### Calculating Tile Quantity for a Wall

For tiling projects, input the wall’s dimensions and the tile size to determine the number of tiles required. This feature saves you time and hassle by providing an accurate estimate of how many tiles you should purchase, ensuring your project stays on track.

### Calculating Cost of Materials

By entering the price per unit of paint, wallpaper rolls, or tiles, you can easily calculate the total cost of materials for your wall project. This functionality helps you budget effectively and avoid any surprises when you get to the checkout counter.

### Converting Measurements

If you have dimensions in feet but need to convert them to meters, or vice versa, the wall calculator can handle the conversion for you. Simply input the measurements, select the desired unit, and the tool will provide you with the converted results instantly.

### Adjusting for Windows and Doors

If your wall has windows or doors that you need to deduct from the total surface area, input the dimensions of these openings. The calculator will subtract their square footage from the total, ensuring you only purchase materials for the wall space that needs covering.

### Calculating Paint Coverage per Gallon

If you want to know how many square feet a gallon of paint can cover, input the paint’s coverage per gallon. The calculator will then provide you with the estimated coverage area, helping you plan the number of paint cans required for your project efficiently.

### Accounting for Multiple Walls

For projects involving multiple walls, input the dimensions of each wall individually, and the calculator will provide you with the total square footage and materials needed for all walls combined. This feature simplifies the planning process for complex wall projects.

### Customizing Units of Measurement

If you prefer working with specific units of measurement such as inches or centimeters, the wall calculator allows you to customize your input and output units. This customization feature ensures you can work with measurements that are most comfortable and familiar to you.

### Saving and Printing Results

Once you’ve calculated the materials needed for your wall project, you can save or print the results for future reference. This feature allows you to keep track of your calculations, making it easy to revisit your estimates or share them with others involved in the project.