The estimation and visualization of a degree of change between a further edited state of code and a selected version of the code. For each of some counted added or deleted portions (e.g., code lines) of code, the system estimates that the added (or deleted) portion complies with a non-review characteristic. The added (or deleted) code lines that comply with a non-review characteristic are excluded from the estimation of the degree of change. Thus, the estimation excludes consideration of added or deleted portions that need no substantial review, while considering more substantial added or deleted portions in the estimations. The estimation is then visualize giving the developer or the reviewer a better idea of the scale of changes that has really been made since the selected version of the code.