How many 12″ tiles for a 8 × 30 ft room?
12" tiles needed
264tiles
264 ft² of tile for a 8 × 30 ft room
| Floor area | 240ft² |
|---|---|
| Buy for+10% cuts and breakage | 264ft² |
| 12" × 12" tiles | 264tiles |
| Thinset (50 lb bags)70 ft² per bag with a 1/4" × 3/8" square-notch | 4bags |
| Grout (0.125" joints)1 × 25 lb bags | 17.7lb |
Notes
- Thinset coverage is set by trowel size, not by room size — a 12" tile needs a 1/4" × 3/8" square-notch, so a 50 lb bag covers about 70 ft².
- Add 15% instead of 10% for a diagonal layout, a room with many jogs, or if the tile has a pattern that has to line up.
- Grout is figured at 0.125" joints and 0.375" tile thickness. Wider joints raise it quickly.
Tiles, and then some
The floor is 240 ft². Buying exactly that much is how people end up back at the store: cuts at the walls, the odd broken tile and a spare box for future repairs mean you order 264 ft² — 10% over.
At 12″ square that works out to 264 tiles.
Thinset depends on the tile, not the room
This is where rule-of-thumb estimates go wrong. A bigger tile needs a bigger notched trowel, and a bigger notch puts down more mortar per square foot. For 12″ tile you want a 1/4" × 3/8" square-notch, which is why the bag count here is 4 rather than whatever a generic calculator returns.
Before you order
Measure the room at more than one point. Rooms are rarely square, and the widest measurement is the one that decides how many tiles the last row needs.
Nearby sizes
- How many 12″ tiles for a 6 × 30 ft room?
- How many 12″ tiles for a 10 × 30 ft room?
- How many 12″ tiles for a 12 × 30 ft room?
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- How many 8″ tiles for a 8 × 30 ft room?
- How many 18″ tiles for a 8 × 30 ft room?
- How many 6″ tiles for a 8 × 30 ft room?
- How many 24″ tiles for a 8 × 30 ft room?
Read more
- Thin-Set Mortar Cost per Bag and per Square FootA bag of thin-set is nine dollars. How many bags you need is decided by the notch on your trowel, not by the tile.
- How Many 12×12 Tiles in 100 Square Feet? 100 — Then Buy 110The arithmetic gives a round number that is right and not enough. Two things separate the count from what you should put in the trolley.
- How Much Extra Tile to Buy: 10%, 15% or 20% — and What Sets the NumberWaste percentage is not a safety margin. It is a prediction about how many cut tiles produce a usable second piece, and the pattern decides it.
- What Size Trowel for Tile? Match the Notch to the Tile, Then Check the BackThe chart gets you to the right aisle. What settles it is lifting one tile and looking at how much mortar actually touched it.