Loona Construction Calculators
Find out how many tiles — and how many boxes — a floor or wall really takes. Enter the area, the tile size and the grout gap in centimetres/millimetres or inches; the calculator counts a tile plus its grout joint for every position and adds an allowance for cuts and breakages.
A 600 × 600 mm tile covers 0.36 m², so one square metre needs 2.78 tiles before waste — about 3.06 tiles with a 10% allowance, or 34 tiles for a 12 m² floor before rounding to whole tiles.
Each tile is laid with a grout joint on two sides, so the floor space one tile actually covers is (tile + gap) squared. With small tiles and wide joints the difference is significant; with large-format tiles it is small but real.
10% is the standard allowance for straight layouts in rectangular rooms. Use 15% for diagonal (45°) layouts, patterned tiles or rooms with many corners and obstacles.
Tiles are laid on a grid where each tile occupies its own size plus one grout joint — the pitch.
Area = Length × Width
Pitch area = (Tile length + Gap) × (Tile width + Gap)
Tiles = Area × (1 + Waste %) ÷ Pitch area, rounded up
Boxes = Tiles ÷ Tiles per box, rounded up
Yes — enter the wall length and its height as the two dimensions. For a whole bathroom, add the walls together or run the calculator once per wall and add the boxes.
Tiles are made in batches (dye lots) and shades vary slightly between them. A spare box from the same batch makes future repairs invisible; a later box may not match.
Yes — switch to Imperial for dimensions in feet, tile sizes and grout gaps in inches. The tile count for the same job matches the metric result.
Add this calculator to your own website or blog — it is completely free, needs no sign-up, and always shows the latest version. Copy the code below and paste it into your page where you want the calculator to appear. Keeping the small “Powered by Loona Automation” credit line under the embed helps keep this tool free — but you are free to style or remove it; the tool works either way.