System and methods to determine the energy consumption per event type from usage data of portable devices are described. An example method to determine the energy consumption of events on a portable device includes receiving data associated with events occurring using at least a portion of the portable device during a time period, the data including a time at which each event type occurred and a total power consumed by the at least the portion of the portable device during the time period, analyzing, via a processor, the received data to determine an energy consumption per an event type of the at least a portion of the portable device based on the times at which each of the event types occurred and the total power consumed, and reporting the energy consumption per the event type for the at least the portion of portable device.