How many 2X2 inch tile needed for 120 square feet?

Answer 1

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.