Frequency Units: Hertz, Kilohertz, and Beyond

What frequency actually measures

Frequency counts how many times something repeats per second — a wave cycling, a signal oscillating, a processor's clock ticking. The unit hertz (Hz) is named after Heinrich Hertz, who proved the existence of electromagnetic waves.

Everyday electrical frequency

Household electricity runs at 50 Hz or 60 Hz depending on the country, a difference that dates back to early competing power standards and still affects which appliances can safely be used where.

Radio and wireless frequency

Radio stations, Wi-Fi, and Bluetooth all operate at specific frequency bands, typically described in kilohertz, megahertz, or gigahertz. Higher frequency generally means more data capacity but shorter range, a tradeoff that shapes wireless technology design.

Computing frequency

A processor's clock speed, measured in gigahertz, describes how many cycles it can execute per second — though modern CPU performance depends on far more than raw clock speed alone, making frequency a rough performance indicator rather than a complete one.

A useful way to think about scale

Hertz to kilohertz to megahertz to gigahertz is a clean thousandfold jump at each step — the same decimal scaling as the rest of the metric system, just applied to repetitions per second instead of physical quantities.