Spatial Analysis - Area of an Irregular Polygon

Application: Geotechnics

  • Format: Online Tool Tool Tip
  • Fee for Use: Free Tool Tip
  • Enrollment: Not Required Tool Tip
Spatial Analysis - Area of an Irregular Polygon


An interactive tool for calculation of the area of an irregular polygon defined by boundary coordinates.

Notes on Spatial Analysis - Area of an Irregular Polygon

  • Coordinate entries must be consecutive ... an X=Y=0 entry is taken as undefined and determines the end of the entry sequence for less than 10 points.
  • Points should be entered in clockwise sequence ... an anti-clockwise sequence results in a negative (otherwise correct) area.
  • The polygon boundary should not cross itself once all points are defined ... a crossed boundary results in an invalid area calculation.
  • -1 000 000 < X < 1 000 000 ... increasing to the right
  • -1 000 000 < Y < 1 000 000 ... increasing upwards

Tool Parameters

Values displayed with a may be changed ... click on a value to display an entry form ... or use the arrows right of a value to select from a list.

Tool Behaviour

This tool exhibits spreadsheet-like behaviour ... change a value and related values are re-calculated automatically.

SVG Plugin

This tool needs SVG viewing capabilities. If your browser does not support SVG then download the Adobe plugin here.

Download Adobe SVG here