Oftentimes, you apply a Well PI Multiplier (WPIMULT) in your HM, and the manager asks, "What is the equivalent skin factor?"
With some simple algebra, you can derive the relation between the two.
This simple Excel calculator uses both Darcy and ECL inflow definitions to derive final skin values for a range of initial skins and a range of WPIMULTs.
📄 Excel workbook
🎥 Video tutorial