An apparatus, method, and system for height-measurement are provided. The apparatus, and method includes initiating, and calibrating a height-measuring-device to capture and store a one-time calibration-mode distance. Then, in operation-mode, a foot-platform connected to a retractable-tape is pulled atop an object/user. Electronic signals from a laser-device are generated as a means to measure both calibration-mode and operation-mode distances. These distances are then resolved and stored as a height-measurement for a user/object, and the resulting height-measurement is displayed on a screen.The height-measurement data from each object/user are compared to one another. The height-measuring-device also includes a predictive algorithm that determines the future height of users.