Tile Layout Calculator

Plan a centered straight grid and expose edge-cut sizes before committing to the first tile line.

Centered tile gridRows, columns and approximate equal edge cuts are visible.

10 × 8centered straight-grid modules

Field tiles before allowance: 80
End cuts (approx.): 11.44 in
Side cuts (approx.): 11.56 in
Tiles with allowance: 88
Surface: 80 ft²

This is a centered straight grid for one rectangle. Dry-lay and shift the grid to avoid sliver cuts; offsets, diagonals, fixtures, movement joints, and reused cuts need a project layout.

Show calculation

columns = ceil((120 + 0.125) ÷ 12.125) = 10; rows = ceil((96 + 0.125) ÷ 12.125) = 8

Transparent method and editable product assumptions. Verify current labels and project requirements.

How this calculator works

Tile plus grout joint forms a repeating module. The calculator determines how many modules cross each axis of one rectangular surface.

A centered grid splits the remaining cut space approximately equally across opposite edges. If this creates narrow slivers, shift the control line and dry-lay again.

The tile count includes every grid position and then applies an allowance. Reuse of opposite edge cuts is not promised, so a real cut plan can differ.

Formula

Modules = tile size + joint; rows/columns = ceil[(surface + one joint) ÷ module]; centered edge cut = remaining span ÷ 2

The live result shows both axes.

Control example: 10 × 8 ft with 12 in tile

A 12 in tile and ⅛ in joint create a 12.125 in module.

The grid needs 10 columns by 8 rows before allowance; approximate centered edge cuts are shown for field verification.

Assumptions and limits

Measure the actual tile, planned grout joint and finished surface after accounting for movement joints and fixed obstructions.
Measurements describe one simple project geometry.
Waste and package values are editable planning assumptions.
It handles one straight rectangular grid, not offset, diagonal, herringbone, irregular rooms, fixtures, movement joints, or optimized cut reuse.

Common measuring mistakes

Mixing nominal dimensions with actual installed coverage.
Skipping whole-package or stock-length rounding.
Failing to verify the page’s stated measurement and product assumptions.
Using a planning estimate outside the limitations stated on this page.

Sources

Product-specific values remain editable. These sources support the method and stated examples; they are not a universal substitute for your supplier’s current label.

The Home Depot tile layout guide Explains finding centerlines, dry layout, joint spacing and avoiding narrow edge cuts.
TCNA installation FAQ Provides industry context for movement joints and installation-system requirements outside a quantity layout.

Questions people ask

What does the Tile Layout Calculator calculate?

Calculate a centered straight tile grid, row and column counts, approximate opposite edge cuts, and tile quantity with allowance.

How does this tile layout calculator work?

Modules = tile size + joint; rows/columns = ceil[(surface + one joint) ÷ module]; centered edge cut = remaining span ÷ 2

Which measurements should I enter?

Measure the actual tile, planned grout joint and finished surface after accounting for movement joints and fixed obstructions.

Does the estimate include every project requirement?

No. It handles one straight rectangular grid, not offset, diagonal, herringbone, irregular rooms, fixtures, movement joints, or optimized cut reuse.

Can I use metric measurements?

Yes. Switch to Metric above the form. The calculator converts the displayed measurements while keeping the same geometry and whole-item rounding.