How to plan a tile layout: start line, edge cuts, and quantities
Where do you start, how do you avoid slivers at the wall, and how many tiles do you need? Tile layout planning in six steps, with a worked example.
You do not plan a tile layout from a corner; you plan it from the line people see first in the room. The grid runs outward from that line until the edge pieces on the left and right match and, where possible, are no narrower than half a tile.
Tile layout planning takes six steps: measure the room, fix the tile size and grout joint, choose the start line, check the edge cuts, align walls with the floor, and work out the quantity with waste. You can do each step on paper or see it at once in a free tile layout planner.
Tile layout planning in six steps
The order matters: count tiles first and decide the layout afterward, and the order is almost always wrong.
- 1. Measure the room in several places—walls are rarely square.
- 2. Fix the actual tile size and the grout joint width.
- 3. Choose the start line: room center, a niche, the vanity, or the door axis.
- 4. Check the edge cuts on both sides and shift the grid until they work.
- 5. Align wall and floor joints, niches, and openings.
- 6. Count full tiles and cut tiles, then add waste.
Measuring: actual size is what counts
Measure the width and height of each surface at both ends. A difference of 10 mm (3/8 in) turns a straight edge piece into a wedge. Note where windows, doors, niches, boxed-in pipes, and fittings sit.
The box shows the nominal size. A “600 × 600” tile often measures 598 × 598 mm, and a 12 × 24 in tile is usually a little under. For planning, use the actual size plus the joint; that module repeats across the whole surface.
Where to start: four start-line options
The start line decides where the cuts land. Compare at least the first two options before you commit.
| Option | Edge pieces | When to use it | Watch out for |
|---|---|---|---|
| Joint on the centerline | symmetrical | when at least half a tile is left at each edge | otherwise you get two thin slivers |
| Tile on the centerline | symmetrical, shifted by half a tile | when a centered joint leaves edges too narrow | mark the middle of the tile accurately |
| Full tile at the visible edge | on one side only | when one side is hidden, such as behind a door or cabinet | the hidden side must not become a sliver |
| Aligned to a niche or fixture | set by the feature | when a niche, vanity, or toilet draws the eye | still check the wall edges |
Edge cuts: a worked example
A wall is 2.60 m wide, the tile is 600 mm, the joint 2 mm. Start in the corner and four full tiles fit, leaving a 192 mm strip at the end. Put a joint on the centerline and only 95 mm is left on each side. Put a tile on the centerline and you get three full tiles and two edge pieces of 396 mm each.
Same wall, same tile, three very different results. As a rule of thumb, edge pieces should be at least half a tile wide; strips under about 50 mm (2 in) break easily when cut and look busy.
- Start in the corner: 4 full tiles, one 192 mm strip.
- Joint on center: 4 full tiles, two 95 mm slivers.
- Tile on center: 3 full tiles, two 396 mm edge pieces.
Align walls, floor, niches, and height
Joints that run from floor to wall look calm but need the same module on both. If the formats do not match, a deliberate offset beats a joint line that almost, but not quite, lines up.
Height works like width: decide where the cut row goes—usually at the floor or under the ceiling, not at eye level. Niches and windows look best when their edges fall on joints; if the size is still open, fit the niche to the grid. The available patterns are covered in the guide to tile layout patterns.
How many tiles do I need?
For a first estimate, divide the area by the area of one tile including its joint, then add about 10% waste for a straight layout and about 15% for a diagonal one. A layout plan is more exact because it counts full tiles and cut tiles separately.
The offcut from one cut can often supply a second edge piece—but only if it is wide enough and the design has no direction. How to judge that is explained in how to calculate tile cuts.
Plan the layout online
Drawing every option by hand takes time. In the free online tile layout planner you enter the room, the tile, and the joint, shift the grid, and see in 3D right away how wide the edge pieces are, how wall and floor meet, and what happens at niches. It runs in the browser with no signup.
Always re-measure on site before cutting: no plan replaces a check measurement on the real wall.