Large format tile is one of the most searched terms in tile, and one of the least precisely defined. A showroom may call a 12×24 plank “large format,” a tile contractor may reserve the name for 24×48 and up, and a porcelain panel the size of a door is in a category of its own. This guide explains what large format tile means, which sizes count, how large tiles differ from slabs and panels, and why bigger tile almost always calls for a leveling system. For step-by-step setting, see our separate guide to large format tile installation.
What is large format tile?
Large format tile is tile with at least one edge longer than about 15 inches. There is no single official definition, but the tile industry generally treats tile over 15 inches on any side as large format, because that is where stricter substrate flatness rules begin.
TileLetter, the magazine of the National Tile Contractors Association, states plainly that there is no true definition for large format tile outside the glass tile category, and that tiles over 15 inches on one side are generally accepted as large format. The 15-inch line comes from flatness rules: TCNA guidance quoted in LATICRETE TDS 164 allows less substrate variation for tiles with at least one edge 15 inches or longer than for smaller tiles. In other words, “large format” is less about looks and more about the point where a tile stops forgiving an uneven floor.
The label has also moved over time. LATICRETE notes that not long ago a 12×12 tile was considered large format. Today 12×12 is an everyday size, and the conversation has shifted to planks, 24-inch squares and panels. Big porcelain and long planks also lead the tile trends Tampa homeowners are choosing in 2026.
Large format tile sizes: which formats count?
Common large format tile sizes include 12×24, 15×30, 24×24, 24×48, 32×32, 36×36 and 48×48 inches, plus long wood-look planks such as 8×48. Anything with one edge over about 15 inches falls in the group. Thin porcelain panels and slabs are larger still and are usually treated as a separate category.
| Format | Typical sizes (inches) | Large format? | Where you see it |
|---|---|---|---|
| Standard square | 12×12, 13×13 | No (under 15 in.) | Floors, older homes |
| Rectangular | 12×24, 15×30 | Yes (24 and 30 in. edge) | Floors, shower walls, feature walls |
| Large square | 24×24, 32×32, 36×36 | Yes | Open-plan floors, commercial spaces |
| Oversized rectangle | 24×48, 30×60, 48×48 | Yes | Floors, bathroom walls, accent walls |
| Plank | 6×36, 8×48, 9×48 | Yes (long edge) | Wood-look floors |
| Panels and slabs | Measured in feet | Own category | Walls, countertops, showers without grout lines |
Tile size names are nominal. A tile sold as 12×24 may measure a little less, and the actual size is what matters when you plan joints. Our guide to rectified tile explains nominal versus actual size and why most large format porcelain is rectified.
Are large tiles and large format tiles the same thing?
In everyday use, yes: “large tiles” and “large format tiles” describe the same products. In technical writing, “large format” is the more precise term and points to tile with an edge over roughly 15 inches, while “large tile” is simply a description that changes with taste.
Some installers also use “large and heavy tile” for tile that needs special mortar because of its weight and size. That is a mortar classification rather than a size class. If a product page, installation sheet or mortar bag says “large format,” read it as a warning that flatness, coverage and lippage control get stricter.
Large format tile vs porcelain panels and slabs
Large format tile is still handled, cut and set like tile, even if it takes two people. Thin porcelain panels and slabs are much larger, very thin, and installed with their own methods, tools and standards. The two overlap in size only at the top end.
The difference shows up in the lippage rules too. In the ANSI A108.02 lippage chart reproduced in LATICRETE TDS 164, gauged porcelain tiles and panels are held to 1/32 inch allowable lippage regardless of joint width. That is a tight number, which is why panels are set with specialized techniques. Regular large format tile, such as 24×48 porcelain, is where a clip-and-wedge leveling system does most of its work.
Why does large format tile need leveling?
Large format tile needs leveling because long edges magnify small problems. A slight bow in the tile, a low spot in the floor or uneven mortar shows up as lippage, a height step between neighboring tile edges, and bigger tiles leave fewer joints to hide it.
Three things work against a flat large-format floor. First, warpage: long porcelain tiles are rarely perfectly flat, and the longer the edge, the more any curve shows. Second, substrate flatness: the TCNA tolerance for tiles with an edge of 15 inches or more is 1/8 inch in 10 feet, with no more than 1/16 inch in 24 inches. Third, narrow joints: LATICRETE notes that joints of 1/8 inch or less are common with large format tile and that tight joints exaggerate lippage. Read what tile lippage is and how it is measured for the full picture.
A leveling system does not flatten a bad floor, but it holds adjacent edges in the same plane while the mortar cures. The Next Level tile leveling system pairs leveling clips in 1/32, 1/16 and 1/8 inch with reusable wedges, designed by real tile installers for ceramic and porcelain tile.
Pros and cons of large format tiles
Large format tiles give a calmer surface with fewer grout lines and less grout to clean. In exchange they need a flatter substrate, more careful mortar work, more handling effort and a plan for lippage. They are not a good fit for tight curves or floors sloped in several directions.
| Advantages | Trade-offs |
|---|---|
| Fewer grout lines and a more continuous look | Substrate must meet a tighter flatness tolerance |
| Less grout to clean and maintain | Warpage and lippage are more visible |
| Works well on floors, walls and showers | Heavier pieces, often a two-person lift |
| Fewer pieces to set per square foot | Cuts around drains and outlets take planning |
Sloped surfaces are the main limit. LATICRETE TDS 164 notes that lippage will be present when tiles 6×6 and larger are set over surfaces sloped to drains, and that smaller units reduce it. That is why bathroom and shower designs often combine large tile on walls with smaller tile on the shower floor; our guide to large format tile in bathrooms and showers covers those choices.
What grout joint goes with large format tile?
For rectified large format porcelain, 1/8 inch is a common grout joint: narrow but visible, and wide enough to absorb normal size variation. Narrower joints are possible only when the tile maker allows them; long tiles in running bond have minimum joints set by ANSI A108.02.
ANSI A108.02 section 4.3.8.1, quoted in LATICRETE TDS 164, sets an average minimum of 1/8 inch for rectified tiles and 3/16 inch for calibrated tiles when any side is longer than 18 inches in a running bond pattern. For the most common size, see what size grout line to use for 12×24 tile, and compare joint looks in 1/16 vs 1/8 grout line. The clip size chart matches each Next Level clip to tile types.
Frequently asked questions
Is 12×24 considered large format tile?
Yes. Its 24-inch edge is well over the 15-inch line the industry generally uses, so it falls under the stricter flatness guidance.
Is 24×24 large format tile?
Yes. Both edges exceed 15 inches, so 24×24 needs a flat substrate, full mortar coverage and attention to lippage.
Do large format tiles need spacers?
Yes. They need a consistent joint, and leveling clips set the joint and keep edges flush at the same time. See large format tile spacers and leveling.
Can large format tile go on walls?
Yes, with mortar rated for the tile and a sound wall. Our guide to large format wall tile covers sizes, layout and walls.
Key terms
- Tile format: the size and shape of a tile, such as 12×24 rectangle or 24×24 square.
- Large tiles: an everyday name for large format tile, without a fixed size threshold.
- Square format tile: tile with equal sides, such as 24×24 or 36×36.
- Rectangular format tile: tile with one long and one short side, such as 12×24 or 24×48, usually set in a stacked or offset layout.
- Nominal tile size: the size a tile is sold as, which can differ slightly from its measured size.
- Porcelain slab: a very large porcelain sheet measured in feet, installed with specialized methods rather than as regular tile.
- Edge warpage: a slight curve along a tile edge, more visible as tile length grows.
- 15-inch threshold: the edge length at which TCNA flatness guidance tightens, commonly used as the line for large format tile.
Sources
- TileLetter (NTCA), Large-format tile: know your numbers for installation success
- LATICRETE TDS 164, Lippage: Causes and Prevention (TCNA flatness, ANSI A108.02 4.3.7 and 4.3.8.1, sloped floors)
Working with large format tile? Next Level clips set 1/32, 1/16 or 1/8 inch joints and hold long edges flush while the mortar cures. The Next Level tile leveling system is sold nationwide by quote. Request a quote for clips and wedges for your large format job.