Windows Explorer alternatives are an option as they usually provide the feature as are programs that have been solely designed to sort files and folders of a partition or hard drive by size. Directory Size Calculator is a free portable software program that belongs to the latter category of applications.

The applications clean interface is divided into two levels. The upper level is displaying the folders and subfolders that are located in the root folder that has been selected by the user. The size of each folder is displayed in Megabytes and as a total percentage of the space. The lower level lists all files of the selected folder including their size and percentage of the total space. This makes it easy to locate the largest files and folders on a computer system.

A right-click on a file or folder opens a context menu with options to move or delete the directory or file, open it in Windows Explorer or export the data in an XML document. Directory Size Calculator should be compatible with most versions of Microsoft Windows. The developer is providing binary and source downloads on his website.