To calculate how many boxes of flooring you will need, you must first measure the area that needs to be covered. Measure the length and width of each room in feet and multiply them together to get the total square footage. Once you have this number, divide it by the square footage listed on each box of flooring to determine how many boxes are needed for your project. For example, if a room is 10ft x 12ft and each box covers 20sq ft., then you would need 6 boxes (10x12=120/20=6). Make sure to round up or add an extra box just in case there are any mistakes during installation.