Is there a way to calculate the roundness of a polygon?

[MarlaJohnson]

Is there a way to calculate the roundness of a polygon?

[XanderBakker]

There is an interesting discussion here: vector - Calculating roundness/compactness of polygon? - Geographic Information Systems Stack Exchan...  and some more background here: Roundness (object) - Wikipedia .

Is that what you are looking for?

[DanPatterson_Retired]

'circularity'  various definitions: aka roundness

You can calculate some of the volume properties using

Bounding Containers ArcMap has an equivalent toolset  (ie convex hull, MABE, aligned rectangle, minimum area circle)

Minimum Area Bounding Ellipse

Concave Hull  The ratio of the convex hull to the concave hull is often a measure of container tortuosity.

[XanderBakker]

An example of what you get when  you execute this field calculation using the Python parser:

4 * math.pi * !SHAPE_Area!  / !SHAPE_Length!**2‍