Tile Size Guide by Room

Pick tile size by where it's going: large-format tile (12x24 or 24x24) makes small rooms feel bigger with fewer grout lines, small or mosaic tile suits shower floors for grip and to follow the slope to the drain, and classic 3x6 subway is the go-to wall tile. Match the size to the job and the room does half the work for you.

Once you've chosen a size, run the room through the tile calculator to turn dimensions into a tile count. Here's how to choose.

Large-format tile for floors and small rooms

Counterintuitively, bigger tile makes a small room feel bigger. Fewer tiles means fewer grout lines, and fewer grout lines means fewer visual interruptions — the floor reads as one continuous surface instead of a busy grid.

• Best for: Small bathrooms, compact kitchens, entryways, and any floor where you want a clean, open look.
• Sizes: 12x24 and 24x24 are the standards. Plank-format porcelain (which mimics wood) is also large-format.
• Bonus: Fewer grout lines mean less grout to seal and less grout to keep clean.

There's a tradeoff: large-format tile is less forgiving of an uneven subfloor and needs a deeper trowel notch, so plan on more thinset per square foot. It also wants a flat substrate to avoid lippage. The reward is a high-end, seamless look.

Small and mosaic tile for shower floors

The shower floor is the one place you usually want small tile, for two practical reasons.

1. Grip. More tiles mean more grout lines, and grout lines give bare feet traction on a wet surface. A large slick tile underfoot in a shower is a slip hazard.
2. Slope. A shower floor pitches toward the drain. Small mosaic tiles flex with that slope, conforming to the curve, where a big rigid tile would have to be cut or would sit unevenly.

Two-inch or smaller mosaics, often sheet-mounted on mesh, are the standard. Just budget for it: all those joints mean mosaics use the most grout of any tile — see our grout coverage guide before you order.

Classic 3x6 subway for walls

The 3x6 subway tile is a wall staple for a reason: it's inexpensive, timeless, and easy to set.

• Best for: Shower and tub surrounds, kitchen backsplashes, accent walls.
• Why it works: The proportions suit a half-offset running bond, which hides minor variation and reads as classic without trying too hard.
• Variations: Larger 4x12 and 4x16 "subway" planks give a more contemporary, elongated look if you want an update on the classic.

Subway is also a forgiving first project — straight cuts, predictable layout, and a pattern that tolerates small imperfections. For how the offset affects your order, see tile layout patterns.

A quick room-by-room cheat sheet

• Small bathroom floor: 12x24 large-format, set in a grid or one-third offset.
• Shower floor: 2-inch (or smaller) mosaics for grip and slope.
• Shower walls / tub surround: 3x6 subway in a half-offset running bond.
• Kitchen backsplash: 3x6 subway, or a small mosaic for a feature strip.
• Open kitchen or living floor: 12x24 or 24x24 to keep large spaces calm and seamless.
• Entryway: Large-format for a clean welcome and easy cleaning.

Don't forget waste and dye lot

Whatever size you choose, the rules of ordering don't change. Add your waste factor — 10% for a grid, 15% for diagonal or offset, up to 20% for herringbone — and buy the full amount in one dye lot so your tiles match closely. A handful of spares from that lot is worth keeping for future repairs.

Measure twice. Buy once.

You'll also want the right setting tools for the size: a bigger notch on your notched trowel for large-format, and consistent tile spacers to keep joints even no matter the tile.

The bottom line

Large-format opens up small rooms and floors; mosaics grip and slope on shower floors; 3x6 subway covers walls. Choose by room, add your waste, order in one dye lot, and let the tile calculator handle the count. For ordering the right overage, see the tile waste factor guide.