How to use the floor plan area calculator
- Rooms: Enter one room per line as name, length, width.
- Select the button and review the result.
Worked example
Three rectangular rooms can be totaled without mixing units.
Method and limitations
Sum of room length × room width.
Conceptual area estimate only; walls, circulation, voids, stairs, structure, and regulations add area.
Common questions
Why might another result be different?
Inputs, rounding, policies, rates, and assumptions can differ. Compare like-for-like values and use current official information when a rate or rule can change.
Does NidXee save my entries?
No. The calculation runs in your browser. Reloading or closing the page may clear it.