House Square Foot Calculator
Calculate house square footage for rooms, floors, additions, renovation planning, and area estimates.
House Square Footage Calculator
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House Square Footage Formula
House square footage is calculated by summing the finished floor area of all livable rooms on each floor. Only heated, finished space above ground counts toward the official square footage in real estate listings.
Add each room's area, hallways, closets, and any finished areas. Exclude garages, unfinished basements, and open porches unless local standards include them. Using this calculator room-by-room gives the most accurate total.
Multi-Story Homes
Add each floor separately. A two-story home with 900 sq ft per floor has 1,800 sq ft of total living area. Measure each floor from the interior walls of the exterior walls.
How to Calculate House Square Footage
- Measure each room: Length × Width for every room, hallway, and closet.
- Sum all rooms per floor: Add every area for that floor level.
- Add all floors: Include finished basement space separately if applicable.
- Exclude garages and unfinished areas: These are not counted as living area.
House Size Reference Guide
| House Size | Square Feet | Typical Rooms |
|---|---|---|
| Small cottage | 500–800 sq ft | 1–2 bed, 1 bath |
| Starter home | 1,000–1,500 sq ft | 2–3 bed, 1–2 bath |
| Average US home | 2,000–2,500 sq ft | 3–4 bed, 2 bath |
| Large family home | 3,000–4,000 sq ft | 4–5 bed, 3 bath |
| Luxury home | 5,000+ sq ft | 5+ bed, 4+ bath |
All Square Foot Calculators
Choose a specialized calculator for your specific project type.
Frequently Asked Questions
Add the area (length × width) of every finished, heated room. Include hallways, closets, and staircase footprints. Exclude garages, unfinished basements, and covered porches.
No. Garages are not included in the livable square footage of a home in standard real estate measurements, even if they are attached and finished.
It depends on local guidelines. In many areas, below-grade finished space is listed separately and not included in the primary square footage. Check local MLS standards.
Price per square foot varies widely by location. Calculate your home's value per sq ft by dividing the sale price by the square footage. Use our price per square foot calculator for this.
The median new single-family home in the US is approximately 2,300 sq ft as of recent census data. The average existing home is closer to 1,800–2,200 sq ft.