Abstract: A shot activated timer system comprises a wearable housing in which control and processing components are in electrical communication with a display, input devices, a power source, a stopwatch, a motion sensor, activation signal components, optional wireless communication components, and optional audio sensors. The motion sensor detects the vibration patterns when a firearm is discharged, and pattern recognition software installed on the control and processor components identifies valid firearm shots. The system communicates with a base unit using a short-range communication protocol. The time it takes for a shooter to discharge his firearm is measured by recording the elapsed time from an activation signal until a shot is fired. When the firearm discharges, the vibration of the shot is sensed by the motion sensor and optionally additionally with the audio sensor. One or more sequential shots can be recorded, and the results can be delivered to the display.