Millihertz to Gigahertz (mHz to GHz)

1 millihertz equals 1×10⁻¹² gigahertz exactly.

1 millihertz = 1×10⁻¹² gigahertz

How to convert millihertz to gigahertz

To convert millihertz to gigahertz, multiply the number of millihertz by 1×10⁻¹². This factor is exact. To go the other way, multiply gigahertz by 1,000,000,000,000.

gigahertz = millihertz × 1×10⁻¹²

Example: 10 millihertz = 1×10⁻¹¹ gigahertz.

About these units

Millihertz (mHz)

Metric (SI)Current unit

One thousandth of a hertz: one cycle every 1,000 seconds.

Millihertz describes oscillations so slow that a single cycle takes many seconds. One millihertz is 0.001 hertz, a period of 1,000 seconds, or about 16.7 minutes. At the other end of the scale, one revolution per minute works out to roughly 16.7 mHz, which is how a clock's second hand turns.

Slow phenomena are the natural home of the unit. The planned space-based gravitational-wave detector LISA is designed to operate from 0.1 to 10 mHz, a band that ground detectors cannot reach. The milli prefix is the SI factor of one thousandth, so a millihertz is a thousand times smaller than a hertz and a billion times smaller than a terahertz. Where signals are slower still, such as a daily cycle near 11.57 microhertz, microhertz take over.

1 millihertz = 0.001 hertz (exactly).

Sources: Wikipedia: Hertz; Wikipedia: Orders of magnitude (frequency); Wikipedia: Revolutions per minute

Gigahertz (GHz)

Metric (SI)Current unit

One billion hertz. Modern processor clocks and Wi-Fi run at gigahertz frequencies.

On 6 March 2000, AMD demonstrated a processor passing the 1 GHz mark, a few days before Intel shipped 1 GHz systems, according to Wikipedia. After that, clock rates rose more slowly: Intel's 3 GHz Pentium 4 arrived in 2002, and later performance came more from design changes than raw speed, since higher clock rates produce more heat. The highest boost clock on a production processor is listed as 6.2 GHz for the Intel i9-14900KS in 2024.

A gigahertz is a billion hertz, the range known as microwaves. The most familiar example may be the kitchen: consumer microwave ovens typically run at 2.45 GHz, a band that is available for industrial, scientific and medical use worldwide. Percy Spencer of Raytheon discovered the heating effect in 1945 when a radar set melted a candy bar in his pocket, and Raytheon sold the first commercial oven, the Radarange, in 1947.

1 gigahertz = 1,000,000,000 hertz (exactly).

Sources: Wikipedia: Clock rate; Wikipedia: Microwave oven; Wikipedia: Gigahertz

Related conversions

See all frequency units.