Tile Calculator: Work Out the Material You Need

What a tile calculator has to do

Multiplying square metres by a fixed markup gives a number, not an answer. A calculator earns its place only when it turns your real room into real quantities:

• Count the whole tiles and the cut tiles at the walls separately, from the real room shape — not the area rounded up to full boxes.
• Compute the waste percentage from the cutting pattern, because the tile format and the joint width change how much of each cut tile is lost.
• Take the tile format and joint width you actually lay — large-format, rectangular or mosaic — not one assumed size.
• Return a cut list: which tiles are cut, at what size, and which offcuts can be reused on the opposite wall.

Why the rule-of-thumb number is usually wrong

The area-times-percentage estimate

Most free calculators divide the floor area by the tile area and add a flat 10 %. It is fast, but it is blind to the room: two floors of the same size can need very different amounts once the walls cut into the field.

Why the format matters

Large-format tiles leave bigger, less reusable offcuts at the perimeter, so the waste climbs; small tiles and mosaic waste less. The number depends on the format you actually chose.

Why placing every tile is exact

A planner that lays out each tile knows exactly which ones are cut and where, so the count and the waste percentage are real for your room instead of a one-size markup.