How much tile for a 12x15 bedroom?
14 boxes of tile for a 12x15 bedroom floor, at the settings most people start with. Below the calculator are the same numbers for the alternatives you are likely to choose, and what each one does to the total.
Reviewed · Method: measured dimensions, industry coverage rates, rounded up to real package sizes · How the numbers are calculated
Values are pre-filled for this page. Change anything and hit Recalculate.
The answer, and what it is made of
A 15 x 12 ft floor is 180 sq ft. Adding 10% for cuts and breakage gives 198 sq ft of tile. Cartons only come in 14.5 sq ft, so you buy 14 cartons of tile — 203 sq ft in total, which leaves 5 sq ft over. That overage is not waste: it is the repair stock you will want in two years, when this colour is no longer made.
Planning figure for everything on that list: $663 to $2,270, with $1,204 as the realistic middle for the products most people actually buy. These are estimates for budgeting, not quotes. Prices move by region and by season, and the middle figure assumes a mid-range product rather than the cheapest thing on the shelf.
The carton is the lever, not the waste. This job takes 14 boxes in a 14.5 sq ft carton and 10 boxes in a 21 sq ft carton — the area never changed, only the packaging. Half-empty cartons are the most expensive line on the receipt.
What changes if you change one thing
| Change the carton size | You buy |
|---|---|
| 10 sq ft carton | 20 boxes |
| 14.5 sq ft carton | 14 boxes |
| 21 sq ft carton | 10 boxes |
Every row is a live calculation, not an estimate. The shaded row is what this page defaults to.
What goes in the cart
| Item | Quantity |
|---|---|
| Tile cartons (14.5 sq ft each) | 14 boxes |
| Thinset mortar, 50 lb bag | 4 bags |
| Grout, 10 lb bag | 1 bag |
| Tile spacers | 200 pcs |
| Mixing paddle + 5 gal bucket | 1 set |
| Grout sponge + float | 1 set |
Keep one unopened box. Dye lots change between production runs — a replacement tile bought in two years will not match. Store it flat and dry.
What this size actually changes
At 180 sq ft this is the largest floor in the house that is still a single room, which makes it the one where layout direction shows most. A 6x24 plank tile laid along the 15 ft dimension makes the room read longer; laid across it, the same room looks wider but every row needs a cut at both ends. The 15 ft dimension divides into 6 in planks almost exactly, which is why long planks usually produce less waste here than square tile.
Figure. 12x15 bedroom floor: 15 x 12 ft. Measure the finished surface, not the room walls — the area between skirting or cabinet faces is the area you pay for.
How the quantity is worked out
Tile is sold by carton, and the carton — not the tile — is what sets your final number. A 15.5 sq ft carton of 12x24 porcelain covers the same area whether the tiles are rectified or pressed, so two products that look identical on the shelf can leave you buying nine cartons or eleven. Always read the coverage printed on the carton, not the square footage of one tile multiplied out.
The waste allowance exists for three reasons: cuts at the perimeter, breakage from a wet saw, and pattern matching if the tile has a repeat. Ten percent is right for a straight lay in a roughly rectangular room. Diagonal layouts, herringbone, and rooms with more than four corners all push the real number to 15 percent or more.
How to measure this job
Measure the room at floor level in both directions, at two points each, because bedrooms are rarely square and a 2 in difference across a 12 ft wall changes the last row. Measure the height from floor to ceiling at each corner for paint, and note where the ceiling drops for a bulkhead or a duct.
For flooring, include the closet if it is getting the same material — a 2x6 ft closet is 12 sq ft and is the item most often left out. For paint, count doors and windows precisely: each standard door is about 20 sq ft of wall you do not paint, and each window about 15.
Mistakes that cost real money
Ordering the exact area and hoping for the best
Cuts alone eat 5 to 8 percent in a simple room. Ordering 144 sq ft for a 144 sq ft floor guarantees a second trip to the store, and the second trip is where dye-lot mismatch happens. The extra carton costs less than the delay.
Assuming the room is square
Bedrooms in houses older than about thirty years are almost never square. If the two width measurements differ by more than an inch, the last row of tile or flooring will be a taper, and you need extra material to handle it. Measure both ends of every wall.
Laying plank tile without staggering the joints
A 6x24 plank with joints lined up across the floor looks like a grid of bricks and shows every slight variation in grout width. Offset each row by a third of a plank. Random-looking stagger is deliberate work, not luck.
Using 10 percent waste for a diagonal plank layout
A diagonal lay in a 12x15 room pushes waste to 15 percent or more, because every plank at the perimeter is cut at an angle and the offcut fits nowhere. The 14 cartons this page calculates is for a straight lay; diagonal needs 15 or 16.
Frequently asked questions
How much extra tile should I buy for cuts and breakage?
Ten percent over the measured area for a straight lay in a rectangular room. Fifteen percent if you are laying diagonally, running a herringbone pattern, tiling several small rooms from one order, or working with a tile that has a visible repeat. Never go below five percent, even in a perfect square.
How much flooring for a 12x12 bedroom?
A 144 sq ft room needs about 156 sq ft with 8 percent waste, which is 7 cartons at 24.5 sq ft. Add the closet separately, and add another carton if the room is out of square or you are laying the planks diagonally.
How much tile for a 12x15 bedroom?
One hundred and eighty square feet, so about 198 with 10 percent waste. In 6x24 planks at 14.5 sq ft per carton that is 14 cartons. A diagonal layout needs 15 or 16.
Is tile a good choice for a bedroom floor?
It is cooler underfoot and harder than carpet or timber, which some people dislike in a bedroom. It is also the easiest floor to keep clean and the only one that tolerates a pet accident without staining. In a warm climate it is a clear win; in a cold one, consider underfloor heating or a large rug.
What will the materials for this cost?
A planning range of $663 to $2,270 for everything in the shopping list, with $1,204 as the realistic middle. That is materials only: it excludes labour, delivery, tool hire and disposal of the old surface. Treat it as a budgeting figure, not a quote.