Network's shortest paths calculation is an important need in transportation network analysis. The Dijkstra
algorithm has long been developed for the shortest path of a pair of nodes calculation individually. A more
practical method to simultaneously calculate all shortest paths of all pair of nodes of a network needs to be
developed. This paper presents the development of a method to calculate simultaneously all shortest paths
of all pairs of nodes of a network. This calculation method, called a Min-Plus Algebra, is a modification of
Max-Plus Algebra, having a special Matrix Power Operation, enable and easier to be executed in spreadsheet
software.