Frequency is defined as the measure of the number of occurrences of a repeating event per unit time. To calculate the frequency, the number of occurrences of the event within a fixed time interval are counted and then it's divided by the length of the time interval. Ex: 1 Hz means that
an event repeats once per second, 2 Hz is twice per second.
Frequency calculation formula is: Frequency = 1 / Time
Frequency unit in SI system is Hertz (Hz). Other common frequency units are kilohertz (khz), megahertz (mhz) and gigahertz (ghz).