How to calculate the square footage of a house
To calculate a house's square footage, measure the length and width of each finished room, multiply them for each room's area, and add the rooms together. Measure each floor of a multi-level home separately, then total the floors. Record measurements in feet to get the area in square feet.
The House Square Footage Calculator totals finished floor area in square feet (ft²) and square meters (m²). Enter each room, or use the multiple rooms calculator to add named sections in one pass.
Method 1, room by room: measure every finished room (length × width), include finished hallways and closets that are above grade, then add the areas. This works best for irregular floor plans.
Method 2, exterior footprint: on a simple rectangular home, measure the exterior footprint (length × width), then subtract the garage and any unheated additions. Exterior wall thickness is typically 6 to 10 inches per side. Room-by-room totals are more accurate for listings.
Buyers, appraisers, contractors, and assessors all read house square footage. The same home can show different totals when one person counts a finished basement and another reports only above-grade gross living area (GLA).
What counts as square footage in a house
Square footage counts finished, heated space with a ceiling at least 7 feet high. Bedrooms, living areas, and finished above-grade rooms count. Garages, unfinished basements, attics, and open-to-below areas do not count. Real-estate listings measure to the ANSI Z765 standard.
Under ANSI Z765, finished means flooring, walls, and ceiling meet the local finish standard. Above grade means the floor sits at or above ground level on at least one side. Heated means a permanent heating system serves the area.
Common exclusions: unfinished basements, attached garages, outdoor decks and patios, unheated sunrooms or screened porches, and below-grade utility rooms. Some markets list a finished walkout basement separately as finished basement area beside above-grade living area.
Attic space counts only when ceiling height reaches 7 ft or more over enough of the floor area to meet local code. Sloped ceilings under dormers often keep attic conversions out of livable square footage.
See the full guide on what counts as square footage for room-by-room rules and listing practice.
Common house sizes in square feet
The table below lists common house sizes in square feet and square meters. Each square-meter value uses the fixed conversion 1 ft² = 0.0929 m². Layout notes describe typical bedroom counts, not a market survey.
Compare your measured house area with these common finished living-area sizes.
| House size (ft²) | Square meters (m²) | Typical layout |
|---|---|---|
| 1,000 | 92.9 | small home, 2 bedrooms |
| 1,200 | 111.5 | compact home, 2-3 bedrooms |
| 1,500 | 139.4 | mid-sized home, 3 bedrooms |
| 2,000 | 185.8 | average-to-large home, 3-4 bedrooms |
| 2,500 | 232.3 | large home, 4 bedrooms |
| 3,000 | 278.7 | large home, 4-5 bedrooms |
How realtors and appraisers measure square footage
Realtors and appraisers measure a home's finished living area to the ANSI Z765 standard. For a detached house, they measure the exterior wall dimensions of each floor. For a condominium or apartment, they measure the interior finished space. Finished basements are usually reported separately from above-grade living area.
Gross living area (GLA) is the finished, above-grade floor area used on many listing sheets. Below-grade finished space may still be valuable living area, yet ANSI Z765 keeps it on a separate line so buyers can compare above-grade totals.
Measure the built house, not only the plans. Construction tolerances can change as-built dimensions by several inches per room. State whether closets and alcoves are included when you publish room or house figures.
Convert a house's size to square meters
To convert a house's square footage to square meters, multiply by 0.0929. A 2,000-square-foot house equals 185.8 square meters. The House Square Footage Calculator shows both units after you total the rooms.
A 2,000-square-foot house equals 185.8 square meters (m²).
Use the square yards calculator for any area.
Other conversions: 1,500 ft² × 0.0929 = 139.4 m². 2,500 ft² × 0.0929 = 232.3 m². 3,000 ft² × 0.0929 = 278.7 m².
When a quote uses square yards, divide square feet by 9, or open the square yards calculator.
House square footage by home type
Home type ranges help you sanity-check a measured total. Actual homes vary by region and era. Use measured length and width for listings, flooring orders, and appraisals.
- Studio apartment: 300-600 sq ft
- 1-bedroom apartment: 600-900 sq ft
- 2-bedroom apartment: 800-1,200 sq ft
- Starter single-family home: 1,000-1,500 sq ft
- Mid-sized single-family home: 1,500-2,000 sq ft
- Large single-family home: 2,500-3,000+ sq ft
Cost and remodel planning often scales with finished floor area. Estimate floor coverage with the flooring calculator and tile coverage with the tile calculator after you know the house total.
House square footage calculator summary
The House Square Footage Calculator helps you calculate the square footage of a house by adding finished room areas floor by floor. Count finished, heated, above-grade living area under ANSI Z765, report basements separately, and convert to square meters with × 0.0929.
Garages and unfinished spaces stay out of living area. Use the size table for common totals, then open room, flooring, or square-yards tools for the next step.