What the Room Area Calculator actually calculates
The tool multiplies length by width for one rectangle and converts the result using 10.7639 square feet per square metre. It makes no deductions for built-ins or allowance for material purchases. An irregular room needs separate non-overlapping rectangles whose areas you add together.
The calculation path
Length multiplied by width gives the floor area; the converted result uses 10.7639 square feet per square metre.
Inputs that can change the answer
- Room length: Enter room length in m.
- Room width: Enter room width in m.
Checks that stay outside the formula
For irregular rooms, split the plan into rectangles and add the results.
A practical order for entering the data
- Measure the room's internal length in metres.
- Measure the perpendicular internal width using the same units.
- Use the square-metre result for area estimates or the square-foot result for comparison with listings.
Project walkthrough: Measure a room before buying furniture or finishes
Project walkthrough: Plan tile quantity, grout, adhesive, and layout together
Project walkthrough: Size a dining table with chair and circulation clearance
Engine check using the prefilled sample
Worked example: room length = 4 m and room width = 3.5 m. Replace the sample dimensions with measurements from the room; split irregular areas into simpler sections where needed.
Results for these inputs
- Area
- 14.00 m²
- Area in square feet
- 150.69 ft²