Tiles for walls and floors are typically measured in square metres (M2) One square metre is equal to one metre in length and one metre in width. If you’re tiling a wall that’s 2.4 metres high by 2 metres wide, multiply it by 2.4 to get 4.8m2. Repeat this for each wall or floor you’re tiling, and add 15% to the total to account for waste and off cuts. This will usually provide you with enough tiles to complete the job. Use our tile calculator to figure out how many tiles you’ll need.