Calculating the number of Eterno pedestals, you’ll need for your project is easy. First, measure the space and calculate the number of tiles you will need to cover the floor space across both the length and the width and add a one to each of these numbers. For example, if your project is five tiles wide and nine tiles long, add a one to each number and then multiply. (5+1) x (9+1) = 60 pedestals needed.