Below is the formula for the distance between the points. On your computer open Google Maps. Some Examples of Distances.
As the crow flies - the straight distance between the points.
To add another point click anywhere on the map. Click Calculate Distance and the tool will place a marker at each of the two addresses on the map along with a line between them. Clearly you the user inputs two points that are used to calculate the distance. Enter the address or the city of the second location.