Hello Craig,
To get the size of the panel including borders use NDockingPanel.FloatingSize.
To get the client size (without borders with caption) use
NFloatingDockingPanelContainer container = nDockingPanel1.ContainerPanel as NFloatingDockingPanelContainer;
container.DisplayRectangle;
To get the height of the caption without borders use NDockManager.CaptionStyle.Height
Best Regards,
Nevron Support Team