Tile Layout Calculator

1 · Measure the tile fields

Room areas

Measurement system

Rectangular areas

Split an irregular room into rectangles. Each area receives its own balanced center layout.

Area 1

Area name

Length

Width

Tile and joints

Tile length

Tile width

Grout-joint width

Use the planned finished joint, including built-in spacer-lug behavior where applicable.

Perimeter movement gap

Reserved between tile and each wall; confirm the required gap and treatment for the assembly.

Tile orientation

Center strategyAuto mode compares tile-centered and joint-centered layouts separately in each direction.

Ordering options

Waste allowance

Coverage per box

sq ft

Enter the exact coverage printed on the carton. Enter 0 to omit boxes.

Price per box (optional)

Display options

Fractional-inch rounding

2 · Balance and mark

Your tile layout

Balanced layoutTotal tiled field119.09 sq ft1 area · 10% ordering allowance

Tiles by area: 131
Whole boxes: 9
Area with waste: 130.99 sq ft
Material cost: Enter price

Scaled planning view. Dashed lines are room centerlines. The outer band reserves the entered perimeter gap. Dry-lay representative tile and verify the room before setting material.

Centerline and edge-cut plan

Area	Direction	Centerline setup	First edge	Opposite edge	Positions
Main area	Along room length	Grout joint centered	11 1/16 in	11 1/16 in	12
Main area	Across room width	Grout joint centered	11 3/16 in	11 3/16 in	10

How to transfer the layout

Verify the room is square enough for the planned reference lines and identify the most visible walls and transitions.
Mark centerlines halfway across each rectangular field.
Where the result says “Tile centered,” place the middle of a dry tile on the line. Where it says “Grout joint centered,” place the joint center on the line.
Dry-lay a row with spacers and confirm both displayed edge pieces before snapping permanent control lines.
Preserve required perimeter and movement joints; do not fill movement space with rigid grout.

Formula and assumptions

tile module = actual tile dimension + grout-joint width
tiled field = room dimension − (2 × perimeter gap)
order area = total tiled field × (1 + waste percentage)
boxes = order area ÷ carton coverage, rounded up

Each area is treated as a straight, square rectangle. Out-of-square walls, openings, cabinets, transitions, patterns, and obstacles require field layout.
Auto balance compares a tile-centered and grout-joint-centered layout independently in both directions, then keeps the option with the larger minimum edge piece.
The placement count describes tile positions in the diagram. Purchase quantities use total tiled area plus waste because cut reuse and breakage cannot be predicted exactly.
Box calculations use the exact coverage entered from the product carton and always round up to a whole box.
The perimeter gap is reserved outside the tiled field. Its required size and treatment must follow the tile, setting-material, substrate, movement-joint, and project specifications.

What makes this different from a tile quantity calculator

Square footage can estimate how much tile to buy, but it cannot tell you where the first control line belongs. This tool draws the actual grid, compares two common centering choices in each direction, and reports the resulting edge pieces.

Dry layout still controls: Tile dimensions, spacer lugs, room squareness, focal walls, thresholds, pattern variation, and obstacles can change the best field layout.

How auto balance works

For each rectangular area, the calculator tests a tile centered on the room centerline and a grout joint centered on the same line. It compares the smaller of the two opposing edge pieces and selects the layout with the larger minimum cut. Length and width are optimized independently.

This follows the practical goal of centered fields and avoiding small perimeter pieces. Daltile’s published installation guidance advises shifting the centerline by half a tile when the original layout creates cuts smaller than half a tile.

Worked example

In a 10-foot field with 12-inch tile and no grout joint, centering a grout line produces ten full tiles. Centering a tile produces two 6-inch edge pieces and nine full tiles. Auto balance therefore selects the grout-centered option for that direction.

Calculation review

Last reviewed: July 26, 2026
Verified fixture: 120-inch field ÷ 12-inch tile = 10 full positions with a centered boundary
Method: Modular interval layout with exact tile size, grout width, perimeter gap, whole-box rounding, and independent axis comparison

Primary installation references: Daltile layout guidance and the Schluter movement-joint guidance. Product instructions and applicable industry standards control the installation.

Frequently asked questions

Should a room be centered on a tile or a grout joint?

Either can be correct. Compare both layouts and keep the one that produces larger, more balanced perimeter pieces at the important walls and transitions.

Why does the calculator show more tile positions than tiles to order?

A position is one placed piece in the grid, including perimeter cuts. Ordering uses total area plus waste because one full tile can sometimes supply more than one cut, while breakage and unusable offcuts add uncertainty.

Can I enter more than one room?

Yes. Add up to eight rectangular areas. Each area receives its own centered layout while material quantities are combined.

Does the perimeter gap become a grout joint?

Not automatically. Perimeter and movement spaces require an appropriate flexible treatment or profile based on the assembly specifications. Do not fill required movement space with rigid grout.

Does this plan diagonal, herringbone, or offset tile?

No. This version models a straight grid. Pattern repeats, offsets, obstacles, transitions, and out-of-square walls require a dedicated pattern layout or field mockup.

Continue planning

Read how to plan a balanced tile layout, use the flooring materials calculator for broader boxed-flooring estimates, or return to all DIY calculators.

Tile-layout disclaimer

This is a planning aid, not an installation specification, substrate evaluation, movement-joint design, waterproofing plan, lippage assessment, or professional tile takeoff. Follow the tile and setting-material manufacturer instructions and applicable project requirements. Review the full measurement disclaimer.