The Midpoint Calculator is a free to use, online tool that displays the midpoint of the line segment. In Mathematics explanations, a midpoint is defined as the middle point of a line segment. 

In geometry, a line segment is defined as a part of a line that is bounded by two distinct endpoints, and contains every point on the line between its endpoints. 

A closed line segment includes both endpoints, while an open line segment excludes both endpoints; a half-open line segment includes exactly one of the endpoints. It should be equidistant from both the endpoints of the line segments. 

It is a halfway point of a line segment. In other words, the midpoint is a point that divides the line segment into two equal segments. 

If (x1, y1) and (x2, y2) are the two endpoints of the line segment, then the formula to calculate the midpoint of the line segment is given as:

Midpoint = [(x1+x2)/2, (y1+y2)/2]. 

The procedure to use the midpoint calculator is as follows:The calculator computes the midpoint of a segment defined by two points A(x1,y1) and B(x2,y2). All you need to do is enter the values of x1, y1, x2, y2, and the midpoint (xm, ym). Then, click on the solve button and the machine will do it for you and display the result in the output field.