Midpoint Formula – Explanation and Examples The midpoint formula is a method for finding the exact center of a line segment. Since a line segment, by definition, is finite, it has two end points. Therefore, another way to think about the midpoint formula is to think of it as a way to find the point exactly between two other points. In that similar fashion, we use the midpoint formula in coordinate geometry to find the halfway number (i.e. point) of two coordinates. Formula to Find the Midpoint To find the midpoint of the straight line in a graph, we use this midpoint formula that will enable us to find the coordinates of the midpoint of the given line. The midpoint formula is used to determine the coordinates of the midpoint of a line segment. Learn the definition with the help of examples and applications.