Megahertz (MHz) and hertz (Hz) are units used to measure frequency, with one megahertz equating to one million hertz. To convert MHz to Hz, multiply the number of megahertz by 1,000,000. For example, 5 MHz equals 5,000,000 Hz. Conversely, to convert Hz to MHz, divide the number of hertz by 1,000,000; thus, 3,000,000 Hz equals 3 MHz. This straightforward conversion is essential in fields like telecommunications, signal processing, and audio engineering, where understanding and manipulating different frequency units is crucial.