Posted by Wall Panels World on 21st Jun 2024

Wall Area Calculator | Square Metre | Square Feet | Obstructions

Wall Area Calculator

For calculating the area of walls in square metres and square feet

Wall 1

How To Calculate Wall Area

Here's a simple guide to calculate the area of a wall, minus the area of any windows, doors, or other obstructions:

What you'll need:

  • Tape measure
  • Pen and paper (or calculator)


  1. Measure the Wall Dimensions:
    • Use your tape measure to find the wall's height (from floor to ceiling) in metres (m).
    • Then, measure the wall's width (distance across the wall) in metres (m).
  2. Calculate the Total Wall Area:
    • Multiply the height (m) by the width (m). This gives you the wall's area in square metres (m²).
    • Formula: Area (m²) = Height (m) x Width (m)
  3. Measure Obstructions (Windows & Doors):
    • For each window or door on the wall, measure its height (m) and width (m).
  4. Calculate Obstruction Area (Each):
    • Multiply the height (m) of each obstruction by its width (m). This gives you the individual area of each window or door in square metres (m²).
  5. Subtract Obstruction Area (Total):
    • Add up the individual areas of all obstructions you measured in step 4.
    • Subtract this total obstruction area (m²) from the total wall area (m²) you calculated in step 2.
    • Formula: Usable Wall Area (m²) = Total Wall Area (m²) - Total Obstruction Area (m²)


  • Wall height: 2.4 metres (m)
  • Wall width: 3.2 metres (m)
  • Window height: 1.2 metres (m)
  • Window width: 1.5 metres (m)
  1. Total Wall Area: 2.4m x 3.2m = 7.68 m²
  2. Window Area: 1.2m x 1.5m = 1.8 m²
  3. Usable Wall Area: 7.68m² - 1.8m² = 5.88 m²


  • If you have multiple windows and doors, repeat steps 4 and 5 for each obstruction and add their individual areas together before subtracting from the total wall area.

This method allows you to determine the actual usable area of the wall after accounting for any windows, doors, or other obstructions.

How To Calculate Square Footage

  1. Measure the length and width of the area in feet.
  2. Multiply the length by the width. This gives you the area in square feet (sq ft).

Formula: Area (sq ft) = Length (ft) x Width (ft)

So, if your wall is 10 feet long and 8 feet wide, the area would be 80 square feet (sq ft).

Conversion from metres to square feet (if needed):

If you have measurements in metres, you can convert them to square feet using a conversion factor of 10.7639. Here's a simple formula:

  • Area (sq ft) = Area (m²) x 10.7639

How To Calculate Square Metre

This guide will help you calculate the area of a flat surface in square metres (m²), the standard unit of area used in the UK.


  1. Measure the Length and Width:
    • Use your tape measure to find the length and width of the area you want to calculate in metres (m).
    • It's important to take accurate measurements for a precise result.
  2. Multiply Length by Width:
    • Once you have both measurements in metres, multiply the length by the width.
    • This gives you the area of the space in square metres (m²).
    • Formula: Area (m²) = Length (m) x Width (m)


Let's imagine you're finding the area of a rectangular carpet that's 2.5 metres long and 1.8 metres wide.

  1. Length (m) = 2.5
  2. Width (m) = 1.8
  3. Area (m²) = 2.5m x 1.8m = 4.5 m²

Therefore, the carpet's area is 4.5 square metres.

Top Tips:

  • If your measurements are in centimetres, convert them to metres before multiplying.
    • Remember, there are 100 centimetres (cm) in 1 metre (m).
    • For instance, a measurement of 175 centimetres is equal to 1.75 metres (175 cm / 100 cm/m).
  • Double-check both your measurements and calculations for accuracy.
  • This method works for any flat surface with a rectangular shape.

Understanding Square Metres:

Think of a square metre as the area covered by a square with sides that are each 1 metre long. By multiplying the length and width of any flat surface (in metres), you're essentially calculating how many of these 1 metre x 1 metre squares would fit within that space.