How many tiles do I need?

Add about 10% for a straight layout and 15% for diagonal or herringbone layouts, which need more cuts. Keep a few spare tiles after the job for future repairs, because later batches can differ slightly in shade.

It depends on the tile and the factory. As a guide, 60 x 60 cm usually comes 4 to a box (1.44 m²) and 30 x 30 cm about 11 to a box (about 1 m²). The label on the box is always right, so change the number in the calculator if yours is different.

Measure each surface separately and add them up. For walls, measure the full height you are tiling and leave out doors and large windows.