Room Area Calculator
AvailableGet the floor, ceiling and wall area of a room, with doors and windows taken off.
Use the calculator
The numbers below are examples. Replace them with yours. Everything is worked out in your browser.
About this calculator
Measure a room once and get the numbers you need for flooring, paint and wallpaper: floor area, ceiling area and wall area with doors and windows taken off.
How it works
- Floor and ceiling area are the length times the width.
- Wall area is 2 times (length plus width) times the height, minus the area of doors and windows.
- Use the same units throughout: metres and square metres, or feet and square feet.
This is a preliminary estimate for planning and shopping lists. It is not a structural design, a safety check or a building-code approval. Ask a qualified professional before you build.
Common questions
Do the results change with feet or metres?
The maths is the same in either unit. Just keep every input in the same unit.
Should I count skirting boards, alcoves or bays?
No. Add the area of alcoves and bays separately if you have them.
Estimates only. Check important numbers before you rely on them.
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