How to use the house square footage calculator
- Footprint length (ft): Outside building length.
- Footprint width (ft): Outside building width.
- Floors: Number of similarly sized floors.
- Excluded area (sq ft): Garage, void, or other area to remove.
- Select the button and review the result.
Worked example
A 50 × 30 footprint over two floors is 3,000 sq ft before exclusions.
Method and limitations
Length × width × floors - excluded area.
Definitions of living, gross, and taxable area differ by jurisdiction and listing standard.
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.