How to use the room size calculator
- Length (ft): Inside room length.
- Width (ft): Inside room width.
- Wall height (ft): Finished wall height.
- Select the button and review the result.
Worked example
A 15 × 12 ft room has 180 sq ft of floor area.
Method and limitations
Length × width = floor area.
Rectangular-room estimate; subtract openings separately.
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.