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Open the attribute table of the polygon shapefile you want to calculate. Add a field called Area, double type. Right click on the field heading in the attribute table and choose calculate geometry. Area should be the default, you will have to choose sq\km from the dropdown. Click OK. The double type will give you plenty of accuracy (decimal places).

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Related Questions

How do you change an area calculation in ArcMap from m to km?

Right click the field heading for your area field in the attribute table and click calculate geometry. Choose sq\km from the dropdown. Click OK


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What is the name the object that is first created when ArcMap starts running?

The first object created when ArcMap starts running is the "Map Document" (MXD file). This document serves as the primary container for managing the map layout, layers, data sources, and other project elements within ArcMap. The MXD file allows users to save their work and settings for future use.


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It is 4,000 times 100 = 400,000 square meters or 4 times 0.1 = 0.4 square km


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data frame properties


Where can the coordinate system for a map display be specified in G.I.S. ArcMap?

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