Multiple Rooms Square Footage Calculator
Enter every room's dimensions and get the whole-house square footage. Perfect for sizing flooring orders, calculating heating loads, or comparing homes.
Last updated:Tip: If you only have the diameter, divide by 2 to get the radius.
L-shape = two rectangles sharing a corner.
Add one row per rectangle and we'll sum them.
How to Measure a Whole House
- Make a list of every finished room. Include bedrooms, bathrooms, the kitchen, hallways, and finished basement areas.
- Measure the length and width of each room in feet.
- Add a row for each room in the calculator above.
- Read the total — that's your whole-house finished square footage.
Excluded under the ANSI Z765 standard: garages, unfinished basements, screened porches, attic storage, and open stairwells (only count the floor opening once, not on both levels).
Typical Whole-House Totals
| Home Type | Typical Sq Ft |
|---|---|
| Studio apartment | 400–600 sq ft |
| 1-bedroom apartment | 600–900 sq ft |
| 2-bedroom starter home | 1,000–1,400 sq ft |
| 3-bedroom family home | 1,500–2,200 sq ft |
| 4-bedroom suburban home | 2,400–3,200 sq ft |
| Luxury home | 3,500–6,000+ sq ft |
Using the Total for Your Project
Once you have the total:
- Flooring: add 10% waste and divide by boards-per-box for your order.
- HVAC: most systems are sized at roughly 1 ton per 500–600 sq ft.
- Paint: for walls only, estimate 2.5× the floor area (wall area ≈ perimeter × ceiling height).
- Real estate: price per sq ft = asking price ÷ total sq ft.
Frequently Asked Questions
Do closets count toward square footage?
Yes, enclosed closets count if they open into a finished room. Walk-in closets always count.
Do I include the garage?
Not in livable square footage. Garages, workshops, and unfinished storage are listed separately in real estate.
What about a finished basement?
Finished, heated basements count as livable area. However, listings often separate "above-grade" sq ft from "below-grade" sq ft.