Calculate area of a polygon

[JohnConnelly1]

I have drawn a polygon in ArcGIS Pro 1.3 now I want to calculate its area

[MervynLotter]

You need to use the* Geoprocessing* tool, Add Geometery Attributes. This

tool will add a column at the end of your attribute table with the desired

area calculation. You need to specify the projection to use in the area

calculation.

[RebeccaStrauch__GISP]

And the help document for that   Add Geometry Attributes—Data Management toolbox | ArcGIS for Desktop

But out as Dan mentioned, if a graphic that will not work unless it us converted if saved to a shape or feature class, if you want the info saved, although you could use the measure tool fir a one-off estimate.  Measure—ArcGIS Pro | ArcGIS for Desktop

you may want to see if any of the tools Jenness Enterprises - ArcGIS Tools; Tools for Graphics and Shapes  will work (I have not tried). They look to be written for Desktop, but if in a toolbox, may work with pro.

[DanPatterson_Retired]

If it is a feature in a geodatabase, a Shape_Area field would automatically calculated.  If it is a graphic, no area will be calculated.