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Floor Tile Calculator

Work out how many tiles a floor, wall or laminate installation needs: enter a room's dimensions or its area directly, pick a common tile size or a custom one, add a waste allowance for cuts, and get a shopping list in tiles and boxes.

Diagonal layouts need more waste because almost every tile touching a wall is cut at an angle and the triangular offcut is rarely reusable; a straight grid lay only trims full tiles along the outer edges, so 10% covers it.

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Reading area and tile size
Applying waste allowance
Calculating tiles and boxes

Result

This page opens the tile calculator set up for floor tiling: enter the room as length × width, or switch to a direct area if you already have it from a floor plan, and pick the tile size you're laying. The calculator divides the area you need to cover by the area of one tile, adds the waste allowance, and rounds up to a whole tile.

Floors take the full 10% standard waste for a straight lay because most rooms have at least one wall that isn't a clean multiple of the tile size, plus doorways and closet openings that eat into whole tiles. Larger floor tiles (18×18in and up) actually waste more material per cut piece even at the same percentage, since a rejected offcut from a big tile is a bigger loss than from a small one — factor that into your budget if you're choosing between sizes.

Floors are also where grout width matters most for the finished look: wider gaps hide size variation between tiles (common on handmade or rustic lines) but read as busier underfoot, while narrow gaps on rectified tiles give the cleanest large-format look. Set the grout gap field to see the effective floor spacing either way. Everything is calculated locally in your browser.

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Accepted Formats & Rules

  • Direct-area or length × width input in feet or meters
  • Six common tile sizes plus a custom width/height option
  • 10% / 15% waste presets with the diagonal-lay explanation
  • Optional tiles-per-box field converts the tile count into boxes to order

Key Benefits

✓ Enter length × width or the area directly, in feet or meters — the calculator works out the tile count from either.
✓ Choose a common tile size (12×12in, 12×24in, 18×18in, 24×24in, 30×30cm, 60×60cm) or type a custom width and height in inches or centimeters.
✓ Waste defaults to 10% for a standard straight lay and can be raised to 15% for a diagonal lay, with a note explaining why diagonal cutting wastes more tile.

Use Cases

  • • Order the right amount of floor or wall tile for a renovation, with a straight-lay or diagonal-lay waste allowance already built in.
  • • Convert a tiles-per-box figure from a supplier's packaging into how many boxes to add to the cart for a given room.
  • • Compare how many tiles two different sizes need for the same room before deciding which is cheaper to buy.