I bought 2 boxes but only needed one, but I'm glad I got 2 boxes as I opened both and used the best tiles from each box.  These are NOT perfect tile and you'll get a decent amount of waste as some tiles really weren't useable for reasons other reviewers listed (tile off center, residue on tiles. etc.).  But for the price it was worth it because they look really nice in the entry closet turned mudroom project.  I installed these on concrete which required the concrete to have primer on it.  Still they didn't stick well but with some liquid nails to help, they are on the floor now and won't be going anywhere.  This was a small project and they were perfect, I'd be hesitant to use them for a larger project.  I'd also recommend you buy more than you need.  On the plus side 'cutting' them was super easy and installation was quick.