Frequency Calculator. This application takes prevents errors when converting between different frequencies. Simply enter the frequency to be converted from and select the output frequency and the app will do all the hard work for you! Hz to kHz. Hz to MHz. Hz to GHz. Hz to THz. Hz to rad/s. KHz to Hz. KHz to MHz. KHz to GHz. MHz to Hz. MHz to kHz. MHz to GHz. GHz to Hz.