Tile Calculator

The calculator begins by computing the total area to be tiled in square feet (or square meters). For rectangular spaces, this is simply length multiplied by width. For more complex rooms with alcoves, closets, or L-shaped layouts, you can add multiple sections together. The tool then divides the total area by the area of a single tile to determine the raw tile count needed before any adjustments.

Waste is the most critical factor that separates a professional estimate from a naive one. Even a straightforward rectangular room requires cutting tiles at the edges, and those cut-off pieces are often unusable. The standard waste factor for a basic grid pattern is 10%, but diagonal layouts—where tiles are set at a 45-degree angle—can waste 15–20% because cuts are longer and off-cuts rarely fit elsewhere. The calculator applies waste by multiplying the raw tile count by (1 + waste percentage), then rounding up to the nearest whole tile, since you cannot purchase a fraction of a tile.

Tile size dramatically affects how waste accumulates. Larger format tiles (such as 24×24 inch or 600×600 mm slabs) produce less grout-line waste but generate more off-cut waste at walls, especially in narrow spaces like bathrooms. Smaller mosaic tiles on mesh backing have very low individual waste but higher labor complexity. The calculator accounts for this by letting you input any custom tile dimension, so the math reflects your actual product rather than a generic assumption.

A common mistake is forgetting to subtract areas that will not be tiled, such as a kitchen island footprint, a built-in bathtub, or large cabinetry that sits on the floor before tile is laid. Failing to subtract these inflates your order unnecessarily. Conversely, never round down on your final order—tiles are produced in dye lots, and if you run short mid-project, an exact color match from a new batch may be impossible. Ordering 10% extra and keeping unopened boxes for future repairs is considered best practice by professional tile setters.