1. A computer-implemented method for scaling an image of a user, the method comprising: generating, via a processor of a mobile device, two or more lines on a display of the mobile device; imaging the user with a camera of the mobile device, wherein the image of the user is displayed on the display of the mobile device; upon determining a feature of the user aligns with the first of the two or more lines on the display of the mobile device, capturing, via the processor, an image of the user; and determining, via the processor, a number of pixels per unit of distance based at least in part on: (i) a number of pixels between a predetermined point on the captured image and the feature of the user; and (ii) a predetermined distance between a camera of the mobile device and the first of the two or more lines on the display.