Electric apparatus capable of power estimating function and power estimating method thereof

An electric apparatus capable of power estimating function and a power estimating method thereof are disclosed. The power estimating method is applicable to an electric apparatus provided with a battery, comprising the following steps of: providing a storing module to story a predetermined user record, a plurality of application programs and a plurality of power consumption parameters corresponding to each application program, the predetermined user record including a predetermined user code and a predetermined application program correspond to the predetermined user code and a theoretical power consumption curve corresponding to the predetermined application program; receiving a user code and choosing a application program; when the user code is identical to the predetermined user code and the chosen application program is identical to the predetermined application program, storing the theoretical power consumption curve as a temporary power consumption curve in a temporary; and detecting the voltage value o