How Many Square Feet Is a 12x15 Room?
A 12 ft × 15 ft room equals 180 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 12x15 Room
| Metric | Value |
|---|---|
| Floor area | 180 sq ft |
| Floor area (m²) | 16.72 m² |
| Floor area (sq yd) | 20.00 sq yd |
| Perimeter | 54 ft |
| Wall area (8 ft ceiling) | 432 sq ft |
| Wall area (9 ft ceiling) | 486 sq ft |
| Wall area (10 ft ceiling) | 540 sq ft |
Common Uses for a 12x15 Space
- master bedroom
- family room
At 180 sq ft, this falls in the medium category — common for primary bedrooms, family rooms, or dining areas.
How Much Flooring Will You Need?
For a 12' × 15' room, buy enough flooring to cover 180 sq ft plus a waste allowance:
| Flooring Type | Waste % | Buy This Much |
|---|---|---|
| Laminate / LVP (plank) | 10% | 199 sq ft |
| Hardwood | 10% | 199 sq ft |
| Ceramic tile (straight) | 10% | 199 sq ft |
| Ceramic tile (diagonal) | 15% | 207 sq ft |
| Carpet | 10% | 199 sq ft (23 sq yd) |
Need an exact estimate? Use our Flooring Calculator for plank count, or the Tile Calculator for boxes of tile.
How Much Paint for a 12x15 Room?
With 8 ft ceilings you'll paint about 432 sq ft of wall. A gallon covers ~350 sq ft, so you'll need 2 gallons per coat. Plan on two coats for a color change.
Detailed breakdown on our Paint Calculator.
Is a 12x15 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 12x15 Room?
At typical US rates of $150–$300 per sq ft for new construction, a 12x15 addition would cost roughly $27,000–$54,000. For remodels:
- Basic flooring replacement: $540–$1,800
- Mid-range remodel: $9,000–$18,000
- Full gut renovation: $18,000–$45,000
Refine with our Cost per Square Foot Calculator.
Frequently Asked Questions
How many square feet is 12x15?
12 × 15 = 180 square feet.
How many square meters is 12x15?
16.72 m².
How many tiles will fit in a 12x15 room?
Depends on tile size. 12"×12" tiles = 199 tiles (with 10% waste). See our Tile Calculator for 6", 18", and 24" sizes.
How much carpet do I need for a 12x15 room?
20.00 sq yd minimum, or 22.00 sq yd with 10% waste for cuts and seams.