An electrically initiated inertial igniter for a munition including: an electrical energy generating device configured to generate a voltage over a duration of an acceleration of the munition; an electrical storage device configured to receive a portion of the voltage over the duration; a circuit powered by the electrical energy generating device, the circuit configured to determine an all-fire condition based on both the portion of the voltage and the duration of voltage generation and a predetermined accumulated voltage of the electrical storage device; and an initiator, the circuit configured to activate the initiator by providing the predetermined accumulated voltage to the initiator when the all-fire condition is determined.