Free Tile Calculator — How Many Tiles Do I Need?

Why grout width and layout matter in tile ordering

Tile estimates are more reliable when the layout matches the installation plan instead of the nominal tile size printed on the carton. This calculator uses room dimensions, the selected tile size, and grout joint width to find the effective coverage of each piece. That matters because grout spacing changes the true field count, especially on smaller-format tiles or accent areas where the joints make up a larger share of the finished surface than many installers expect.

Preset sizes handle common ceramic and porcelain jobs quickly, while the custom option works for specialty rectangles, natural stone pieces, and imported formats. The result helps you compare tile count against square footage ordered, which is useful because some boxes are sold by piece count while others are sold by nominal coverage. Entering tiles per box gives you a purchase-ready box count rather than just a raw math result that still needs to be converted at the supplier desk.

When to increase waste for diagonal or patterned installs

A straight-set layout can often stay near the lower end of the waste range if the room is square and the installer has a consistent starting point. Diagonal layouts, herringbone-style patterns, offset planks, and rooms with a lot of jamb cuts usually need more. This page adds a small layout premium on top of your selected waste factor when diagonal is chosen, which mirrors the extra trim loss that often shows up once the cuts start at walls and transitions.

Ordering slightly more tile than the minimum also protects you later. Boxes can arrive with shade variation, corner damage, or discontinued lots, and matching a few replacement pieces months after installation is not always easy. Print the estimate, note the manufacturer and dye lot, and keep one unopened box when the job closes out if the budget allows. That small habit saves headaches on warranty callbacks and future repair work.