About the Ceiling Area Calculator
Ceiling area and the paint, plasterboard or tiles needed to cover it.
Also known as: ceiling square meters, ceiling paint area, ceiling size calculator.
How to use this calculator
- Enter ceiling shape, length, width and the other fields.
- The result updates instantly as you type — press Calculate (or Enter) at any time.
- Review the breakdown shown under the main result.
- Use Copy result or Share to save the answer or send a link with your inputs.
Formula
area = length × width (÷ cos pitch for a sloped ceiling)
Worked example
Using the values pre-filled in the calculator above:
- Ceiling shape: Rectangular
- Length = 5 m
- Width = 4 m
the calculator returns:
- Ceiling area: 20 m²
- In square feet: 215.28
- Paint needed (2 coats): 3.64 litres
- Plasterboard sheets (2.88 m²): 8