Embodiments disclosed herein provide systems, methods, and software for dynamically managing power consumption of a device capable of operating on battery power, or other power. In particular, the size of the viewable area of the display may be dynamically controlled to reduce the number of activated pixels to reduce power consumption. The resizing of the viewable area of a screen may also reduce the number of applications running, thereby reducing power consumption. An indication of the amount of operation time, battery indicator, and/or energy left in the battery may be presented, based at least in part on the dynamic resize of the display.