An apparatus for sizing a window covering in a retail outlet includes a housing with a first working end, a second working end, and a top operating surface adapted to support a window covering. The window covering includes first and second ends and a connector disposed approximately midway between the first and second ends. A cutting element is disposed on the first working end and defines a cutting plane. A locator is axially slidable on the housing relative to the cutting plane and is adapted to engage the connector of the window covering.