18x18 what? 18 feet x 18 feet? 18 microns x 18 microns?
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In order to answer this question, we need to convert the dimensions of the tiles into ft. This makes all units consistent, and so easier to work with. There are 12 inches in a foot, and so to convert from inches to feet you need to divide by 12. In this case the tiles are 18x18, so divide this by 12 and you get 1.5ft x 1.5ft This means the tiles have an area of 2.25 sq ft. To find how many are needed for 800 sq ft, you just divide: 800/2.25 = 355.555555... Therefore, you would need 355.5 recurring tiles to cover the whole area.
356 of them. Get 390 to be safe.
800 x 144 = 115,200 / 95 = 1,212 tiles. You might want to buy a few extras...
It depends on the units used to measure the tile: 12inch*24inch, 12cm*24cm or some other, unspecified unit.
20*20 square feet tile = 400 square feet, so in principle, two tiles will cover 800 square feet, which is more than enough. This is provided that the offcuts can be used.