Enter your room size and chosen tile size to instantly see how many tiles and boxes to buy, including a sensible wastage allowance for cuts and breakage.
Add 10% for a standard straight layout, and 15–20% if you're laying tiles diagonally or the room has lots of corners, alcoves or curves.
Split the room into rectangles, calculate the area of each separately, add them together, then run the total through this calculator as one combined room area.
Grout lines take up a small amount of extra space between tiles. The wastage allowance in this calculator comfortably covers standard grout-line spacing.