The amount of grouting material required will depend on the size of the tiles. If the tiles are small, such as mosaic tiles, there will be a lot more required (because there is a much greater number and therefore area of joints) than for large format tiles.
The type of grout being used will also affect the amount.
One grout manufacturer's calculator is given as a Related link to this question.
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Approximately 900 square feet of tile, less the area taken up by grout.
160 of them.
154 floor tiles. A tile measuring 12 inches on each side is one square foot, hence 154 square feet.
Total, there are 48 inches all the way around a 1 foot square tile.
one square foot is 144 sq inches, your tile is 4 square inches, therefore 144/4= 36 pieces per square foot, so 36x120=4,320 tiles however, it will be less then that depending upon the size of your grout line and if the tile is truly 2x2. (some tile says its 4x4 for example, but if you measure it will be 3 and 5/8 or something so its important to physically measure the tile One easy way would be to buy the small tiles on the mesh backing, like mosaic, they come in 1 sq ft pieces so you'd need 120. They are easy to install and your grout lines will be very consistant.