Convert Frequency from kilohertz to hertz (kHz to Hz)

kilohertz to hertz Conversion Formula

Example

Let's convert 5 kilohertz (kHz) to hertz (Hz).

Using the formula:

Therefore, 5 kilohertz (kHz) is equal to 5000 hertz (Hz).

How many kilohertz are in one hertz? One hertz (Hz) contains 0.001 kilohertz (kHz) — the inverse of the factor above. Multiplying by 1000 takes you from kilohertz to hertz; multiplying by 0.001 brings you back.

Put in words: one kilohertz equals 1000 hertz, so the kilohertz is the larger unit of this pair. Converting between them never changes the amount of frequency being measured — only the size of the unit you count it in.

What is a Kilohertz (kHz)?

A kilohertz (kHz) is a unit of frequency in the International System of Units (SI), equal to one thousand hertz (1000 Hz). The plural form is kilohertz.

It's a term you'll encounter in everything from sound and radio to the history of computing.

Key Takeaways

• A kilohertz (kHz) is a unit of frequency equal to 1,000 hertz (Hz).
• Human hearing typically ranges from 20 Hz to 20 kHz.
• It is the standard unit for AM radio broadcasting frequencies.
• Early computers had processor speeds measured in kHz.

How Does Kilohertz Relate to Human Hearing?

Your ability to perceive sound, from the deepest bass to the highest treble, is measured in hertz and kilohertz.

The range of human hearing typically falls between 20 Hz and 20 kilohertz (20,000 Hz).

The frequencies most sensitive to the human ear, particularly for understanding speech, are concentrated in the range of 1 to 4 kHz. This is why audio engineers and audiologists pay close attention to this specific spectrum when mixing music or conducting hearing tests.

Why Do AM Radio Stations Use Kilohertz?

Kilohertz is the fundamental unit used for AM (Amplitude Modulation) radio broadcasting.

AM radio stations operate in a frequency range from 535 to 1705 kilohertz in the Americas, often referred to as the medium wave band.

Each station is assigned a specific frequency, like 820 kHz or 1010 kHz, which your radio receiver tunes into to capture the broadcast signal. This contrasts with FM radio, which broadcasts in the much higher megahertz (MHz) range.

Where Else is Kilohertz Used in Technology?

While today's computers boast processor speeds in gigahertz (GHz), the pioneers of computing operated at much slower speeds measured in kilohertz.

For instance, the Intel 4004, the world's first commercial microprocessor, was released in 1971 with a clock speed of just 740 kHz.

Beyond computing, kilohertz frequencies are also crucial in other technologies. A key example is medical ultrasound, where transducers emit sound waves in the high kHz to low MHz range to create diagnostic images of the body's organs and tissues.

What Is a Hertz (Hz)?

Hertz (Hz) is the standard unit of frequency, measuring the number of cycles per second.

You encounter it everywhere in modern technology, from the sound you hear and the screen you're looking at to the speed of your computer's processor (CPU). The plural form is simply hertz.

Who Was Heinrich Hertz?

The unit is named in honor of the German physicist Heinrich Rudolf Hertz.

In the late 1880s, he was the first person to provide conclusive proof of the existence of electromagnetic waves. His groundbreaking experiments laid the groundwork for the development of radio, television, and all forms of wireless communication.

What Is Hertz Used For in Everyday Technology?

Hertz is a fundamental measurement you encounter in everyday technology, often without realizing it. Here are two of the most common examples:

Sound Waves and Pitch

A sound's pitch is determined by its frequency (measured in hertz): higher frequencies produce higher pitches.

For example, the A above middle C on a piano is standardized at 440 Hz.

Screen Refresh Rates (60 Hz vs. 120 Hz)

The refresh rate of your computer monitor, TV, or smartphone screen is measured in hertz.

This number indicates how frequently the display updates the image per second—a higher value results in smoother motion, which is especially noticeable in videos and gaming.

• 60 Hz: Updates the image 60 times per second. This is the standard for most displays.
• 120 Hz: Updates 120 times per second for much smoother on-screen movement, making it great for gaming.
• 240 Hz: Updates 240 times per second, offering exceptionally fluid motion for professional and competitive gamers.

What Does Gigahertz (GHz) Mean for Computers?

When discussing computer processors, you often hear the term gigahertz (GHz). One gigahertz is equal to one billion hertz (1 GHz = 10⁹ Hz).

This value represents the processor's CPU clock speed—the number of processing cycles it can execute per second.

Before gigahertz became the standard, speeds were often measured in megahertz (MHz), where 1 GHz equals 1,000 MHz. While not the sole indicator of performance, a higher clock speed generally means a processor can perform calculations and execute instructions more quickly.

kilohertz to hertz Conversion Table

Here are some quick reference conversions from kilohertz (kHz) to hertz (Hz):