It depends on the area you want to cover and the tile you choose. In each product page, there is a calculator that will help you determine the quantity needed to cover your area such as a backsplash, bathroom, shower etc. All you need to do is to click on "HOW MANY TILES DO I NEED", enter the square feet needed and the calculator will tell you how much of that specific tile you will need. If you don't know the square footage, click on the "Help to calculate my square footage" blue link, and enter the height and length of your wall or floor and the calculator will give you the result in the number of tiles or boxes you need.