Area Calculation using Summarize Within

[KristalWalsh]

I'm working in ArcGIS Pro v3.3, using Model Builder to create a workflow where one branch summarizes the acres of forested landcover classes within the AOI. The landcover feature class includes a definition query which is accurately reflected in the process and the count of polygons seem to be correct on a test AOI. But to check/compare acres (that my output was correct), I clipped the landcovers using the same boundary and came up with ~1400 more acres than the Summarize Within calculation. Was this the totally wrong move? I can't imagine there would be this big of a difference! Am I completely misunderstanding the summarize tool? Thank you for your help on this - need to move past this step. 

[KristalWalsh]

@DanPatterson it turns out that one of our data layers had an incorrectly calculated acres field. So, it wasn't the tool at all and I can confidently say now that the clip and summarize within have consistently calculated the area with the same output but in sq. km.  It wasn't until I went feature by feature to examine the area calculation that I found the error. Thank you for all your suggestions and support on working through this! 

[DanPatterson]

no problem