Tile Calculator

Measure the floor or wall and subtract any area that will not be tiled. Add your chosen allowance, divide by the area of one tile, and round up to a whole tile. Divide this count by the number of tiles in a box and round up again.

A 12 ft × 10 ft floor has 120 square feet. With 10% extra, plan for 132 square feet. Each 12 × 24 inch tile covers 2 square feet, so you need 66 tiles. At 8 tiles per box, buy 9 boxes containing 72 tiles. Six tiles are additional to the allowance because of box rounding.

Example: tiles measured in centimetres

A 4 m × 3 m floor has 12 m² of area, or 13.2 m² with 10% extra. A 30 cm × 60 cm tile covers 0.30 × 0.60 = 0.18 m². Divide 13.2 by 0.18 and round up to 74 tiles. At 8 tiles per box, buy 10 boxes containing 80 tiles. Six tiles are added by box rounding.

Understand the box cost breakdown

At an example $40 per box, 9 boxes cost $360. Before the 10% allowance, the 60-tile requirement already needs 8 whole boxes, costing $320. The allowance pushes the order to 9 boxes, adding $40. The result panel shows this difference rather than pricing a fractional box.

Enter your supplier’s price per box. Changing currency converts that entered price using dated daily reference rates; it does not retrieve retail tile prices. Adhesive, grout, trim, delivery, labour and tax are separate costs.

Allow for cuts and check the packaging

The worked example uses a 10% allowance. Enter an allowance that suits your project. Porcelanosa’s measuring guide includes an extra allowance for breakage and future replacements. Complicated patterns, awkward edges and large tiles can require a different amount. Confirm your layout with the installer before ordering.

This is an area estimate for a single rectangular tile size. It does not optimise cut pieces or deduct grout joints. Use actual tile dimensions, and check the manufacturer’s stated box coverage, especially for mosaics, nominal sizes and mixed-size packs. Different designs and batches should be calculated separately.

For an L-shaped room, split the floor into rectangles without overlapping them. The form estimates one rectangular surface at a time. To combine sections by hand, add their net areas and use the formula above, rounding tiles and boxes only after combining the areas. Adding separately rounded box counts can overstate the order. Use the linear feet calculator for continuous strip coverage; it does not replace tile counting. The area and length guide explains that distinction.

Measuring reference: Porcelanosa: tile quantities and boxes. Unit definitions: NIST conversion factors.