A stent-graft planning system is a web-based system that assists a physician in selecting and ordering the right stent-graft online in real-time. The stent-graft planning system includes a graphic user interface that provides a physician with a two-dimensional (2D) graphic model reflecting the individual vessel anatomy, e.g., aneurismal anatomy, and the selected stent graft in that anatomy. A data entry region in the graphic user interface is used in collecting each measurement. A stent-graft planning progress guide region of the graphic user interface tells a user the active step in the stent-graft-planning process. A navigation region of the graphic user interface includes features for navigating the stent-graft planning process.