How Many Square Feet Is a 15x15 Room?
A 15 ft × 15 ft room equals 225 square feet. Use the calculator below to double-check or customize with waste and cost.
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.
Key Measurements for a 15x15 Room
| Metric | Value |
|---|---|
| Floor area | 225 sq ft |
| Floor area (m²) | 20.90 m² |
| Floor area (sq yd) | 25.00 sq yd |
| Perimeter | 60 ft |
| Wall area (8 ft ceiling) | 480 sq ft |
| Wall area (9 ft ceiling) | 540 sq ft |
| Wall area (10 ft ceiling) | 600 sq ft |
Common Uses for a 15x15 Space
- master bedroom
- living room
At 225 sq ft, this falls in the medium category — common for primary bedrooms, family rooms, or dining areas.
Best Furniture Layout for a 15x15 Room
At 225 sq ft, a 15x15 space supports distinct zones — for example sleeping + seating in a primary suite, or dining + buffet in a family room. The square footprint lets you divide the room visually with a rug or lighting without building walls.
- King bed (76×80 in) + two nightstands + bench at foot + 6 ft dresser.
- 72 in dining table (seats 6–8) + sideboard + corner bar cart in a master bedroom.
- Sectional sofa (96 in) + coffee table + TV stand + single accent chair.
15x15 vs Other Common Room Sizes
If you are deciding between two footprints, compare total square footage and how each layout affects furniture clearance — not just the length and width numbers.
- 14×16 — saves 1 sq ft versus 14×16 — tighter furniture layout.
- 12×20 — adds 15 sq ft over 12×20 — more seating or storage options.
How Much Flooring Will You Need?
Wondering how much flooring do I need for a 15x15 room? The floor area is 225 sq ft — buy that much plus a waste allowance:
| Flooring Type | Waste % | Buy This Much |
|---|---|---|
| Laminate / LVP (plank) | 10% | 248 sq ft |
| Hardwood | 10% | 248 sq ft |
| Ceramic tile (straight) | 10% | 248 sq ft |
| Ceramic tile (diagonal) | 15% | 259 sq ft |
| Carpet | 10% | 248 sq ft (28 sq yd) |
Need an exact estimate? Use our Flooring Calculator for plank count, or the Tile Calculator for boxes of tile.
How Many Gallons of Paint for a 15x15 Room?
With 8 ft ceilings you'll paint about 480 sq ft of wall. A gallon covers ~350 sq ft, so you'll need 2 gallons per coat and 3 gallons for two coats.
Detailed breakdown on our Paint Calculator.
Is a 15x15 Room Big?
This is a large bedroom or medium living room. It comfortably fits a king bed with additional furniture, or a sofa set with a coffee table.
How Much Does It Cost to Build a 15x15 Room?
At typical US rates of $150–$300 per sq ft for new construction, a 15x15 addition would cost roughly $33,750–$67,500. For remodels:
- Basic flooring replacement: $675–$2,250
- Mid-range remodel: $11,250–$22,500
- Full gut renovation: $22,500–$56,250
Refine with our Cost per Square Foot Calculator.
Frequently Asked Questions
How many square feet is 15x15?
15 × 15 = 225 square feet.
How many square meters is 15x15?
20.90 m².
How many tiles will fit in a 15x15 room?
Depends on tile size. 12"×12" tiles = 248 tiles (with 10% waste). See our Tile Calculator for 6", 18", and 24" sizes.
How much carpet do I need for a 15x15 room?
25.00 sq yd minimum, or 27.50 sq yd with 10% waste for cuts and seams.
How many gallons of paint for a 15x15 room?
About 480 sq ft of wall at 8 ft ceilings. One coat needs 2 gallons; two coats need 3 gallons at 350 sq ft per gallon.
How much flooring do I need for a 15x15 room?
225 sq ft of floor area. With a 10% waste factor, order 248 sq ft of laminate, hardwood, or LVP. See the Flooring Calculator for box counts.
What furniture fits in a 15x15 room?
King bed (76×80 in) + two nightstands + bench at foot + 6 ft dresser.