Frequency counts cycles per second, measured in hertz. The SI prefixes step by 1,000: 1 kHz = 1,000 Hz, 1 MHz = 1,000,000 Hz and 1 GHz = one billion Hz. Rotational speed in RPM converts by dividing by 60, so 3,000 RPM equals 50 Hz, the mains frequency in India and Europe. This converter is handy across audio (human hearing spans roughly 20 Hz to 20 kHz), radio (FM broadcast sits between 88 and 108 MHz), Wi-Fi (2.4 and 5 GHz bands) and processor clock speeds.
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