This is a companion tool to the Square of 9 charting tools. The Calculator may be resized by the user to represent the current market ( i.e. 10000 points on the Dow Jones ).
The graphic shows the Square of 9 with the limit set to 20. The limit price on the square 400 which is 20 squared. The calculator is designed to be set by the user and to display the cardinal cross on the square making it easier to locate the various pressure points.