The calculator is intended for calculation of the area of the any (not crossed) polygon on coordinates of its tops. Coordinates are entered in the form of x+iy imaginaries where x  ordinate, and y  a point abscissa. The round of all tops is made sequentially or clockwise or counterclockwise.
The polygon coordinates divided by gaps  

Injected coordinates of a polygon 
The area of the given polygon (in the conventional units) 