Tile Calculator

Compute the area in square feet (length × width) and the area of one tile (tile length × tile width). Divide the floor or wall area by the area of one tile to get tiles needed before waste. Multiply by one plus the waste percent and round up to the next whole tile. Always order a few extra for cuts, breakage, and future repairs.

10 percent is a fair default for a rectangular room with straight-set square tile. Add more for diagonal or herringbone patterns (15 to 20 percent), small mosaic sheets, oddly shaped rooms, or projects with many cuts. The waste percent you enter is added on top of the bare tile count and the total is rounded up.

Use the nominal tile size as sold (for example, 12 × 12 inch, 6 × 24 inch, 18 × 18 inch, or metric sizes like 30 × 30 cm). Do not subtract grout-line width unless the grout joints are wide enough to materially change the per-tile area. For most square or rectangular tile work, the nominal size is the right input.

Yes. Compute the wall area you want to tile and use that for area length × area width (or enter the total square footage as length and use width = 1 for a quick override). The math is the same for floor and wall installations; the waste allowance is often a touch higher on vertical surfaces because of cuts around outlets, faucets, and corners.

The cost line is tiles-with-waste multiplied by your entered price per tile. It does not include grout, thinset, spacers, edge trim, sealer, underlayment, removal, delivery, sales tax, or installation labor. Treat it as a tile-only planning figure and add the surrounding materials separately.

Yes. Boxes of tile usually come in fixed counts, so the order will round up regardless. The calculator returns the final ceiling number of tiles needed including waste, but it is still worth verifying box quantities at purchase. Saving a few intact tiles after the install is helpful for future repairs.