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Room Area Calculator

Floor, wall and ceiling area of a room in one go — everything you need for a decorating order.

Enter values

Results update as you type.

Result

Floor area

20 m²

Ceiling area
20 m²
Net wall area
39.2 m²
Total surface to decorate
59.2 m²
Perimeter (for skirting)
18 m
Room volume
48 m³
Floor in square feet
215.28

About the Room Area Calculator

Floor, wall and ceiling area of a room in one go — everything you need for a decorating order.

Also known as: room size calculator, room square meters, room measurement, room dimensions.

How to use this calculator

  1. Enter room length, room width, ceiling height, doors and windows area.
  2. The result updates instantly as you type — press Calculate (or Enter) at any time.
  3. Review the breakdown shown under the main result.
  4. Use Copy result or Share to save the answer or send a link with your inputs.

Formula

floor = l × w · walls = perimeter × height − openings

Worked example

Using the values pre-filled in the calculator above:

  • Room length = 5 m
  • Room width = 4 m
  • Ceiling height = 2.4 m
  • Doors and windows area = 4 m²

the calculator returns:

  • Floor area: 20 m²
  • Ceiling area: 20 m²
  • Net wall area: 39.2 m²
  • Total surface to decorate: 59.2 m²