https://community.esri.com/t5/arcgis-pro-questions/calculate-geometry/m-p/1556398#M89889 <P>I am trying to calculate the area of a group of polygons, but to first test Calculate Geometry tool (which I've never used) I started with a 1/4 square mile box. Area is the field I created for the calculations. I set the Data Type to Double and the number format to Numeric and I am using the Coordinate System of the map. When calculating square miles I get 0.0625. I have changed Coordinate System, I have changed Projection, everything I can think of but the results are the same:</P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="JeffreyStewart_0-1731000638303.png" style="width: 400px;"><img src="https://community.esri.com/t5/image/serverpage/image-id/119060iBF886AD63BD7665F/image-size/medium?v=v2&amp;px=400" role="button" title="JeffreyStewart_0-1731000638303.png" alt="JeffreyStewart_0-1731000638303.png" /></span></P><P>Oddly enough, when I change from square miles to US Survey Acres the answer is correct.&nbsp;</P><P>Can anyone offer some insight into what I may be doing incorrectly?&nbsp;</P> Thu, 07 Nov 2024 17:34:35 GMT JeffreyStewart 2024-11-07T17:34:35Z https://community.esri.com/t5/arcgis-pro-questions/calculate-geometry/m-p/1556398#M89889 <P>I am trying to calculate the area of a group of polygons, but to first test Calculate Geometry tool (which I've never used) I started with a 1/4 square mile box. Area is the field I created for the calculations. I set the Data Type to Double and the number format to Numeric and I am using the Coordinate System of the map. When calculating square miles I get 0.0625. I have changed Coordinate System, I have changed Projection, everything I can think of but the results are the same:</P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="JeffreyStewart_0-1731000638303.png" style="width: 400px;"><img src="https://community.esri.com/t5/image/serverpage/image-id/119060iBF886AD63BD7665F/image-size/medium?v=v2&amp;px=400" role="button" title="JeffreyStewart_0-1731000638303.png" alt="JeffreyStewart_0-1731000638303.png" /></span></P><P>Oddly enough, when I change from square miles to US Survey Acres the answer is correct.&nbsp;</P><P>Can anyone offer some insight into what I may be doing incorrectly?&nbsp;</P> Thu, 07 Nov 2024 17:34:35 GMT https://community.esri.com/t5/arcgis-pro-questions/calculate-geometry/m-p/1556398#M89889 JeffreyStewart 2024-11-07T17:34:35Z https://community.esri.com/t5/arcgis-pro-questions/calculate-geometry/m-p/1556437#M89890 <P>The calculation in sq mi seems to be correct.</P><P><STRONG>Shape_Length</STRONG> is the perimeter of your box (square) polygon. Each side is 5280/4 = 1320 ft</P><P>Area is 1320 x 1320 = 1,742,400 sq ft</P><P>1 sq mi = 27,878,400 sq ft</P><P>1,742,400 / 27,878,400 = 0.0625 sq mi</P> Thu, 07 Nov 2024 18:24:54 GMT https://community.esri.com/t5/arcgis-pro-questions/calculate-geometry/m-p/1556437#M89890 BarryNorthey 2024-11-07T18:24:54Z