Tiles and boxes for a floor, with extra for cuts.
AdvertisementA 10x8 ft bathroom floor needs 88 tiles of 12x12 in, including 10% extra for cuts.
We multiply the floor's length by its width, add extra for cuts and breakage (10% for most rooms, 15% for diagonal layouts), and divide by the area of one tile. Boxes are rounded up to whole boxes.
Buy 10% extra for a straight layout and 15% for diagonal or herringbone patterns, or rooms with many corners and cuts.
Barely. Grout lines of 1/8 to 1/4 in reduce the tile count slightly; the extra for cuts more than covers the difference.
A 10x10 ft room is 100 sq ft, and each 12x12 in tile covers 1 sq ft. With 10% extra for cuts, buy 110 tiles: 11 boxes of 10.
Split the floor into rectangles, enter each one separately, and add up the tiles. Add the extra for cuts to each part, since every part has its own edges to cut.