kHz to GHz Converter

How to convert kilohertz to gigahertz?

Kilohertz to Gigahertz Converter spans six orders of magnitude (1 GHz = 1e6 kHz) and is essential for RF engineers, audio technicians moving to high-bandwidth digital, computer scientists comparing CPU clock to bus clock, ham radio operators tuning from HF (3 to 30 MHz) to UHF (300 MHz to 3 GHz), and students learning the electromagnetic spectrum. The tool returns clean decimal GHz, with scientific notation available for extreme inputs. Common conversions: a 2.4 GHz WiFi channel is 2,400,000 kHz; a 100 kHz AM radio carrier is 0.0001 GHz; a 5 GHz 5G mid-band is 5,000,000 kHz. Every step is exact division by 1,000,000, no rounding loss whatsoever.

f_(GHz) = f_(kHz) / 1,000,000

Example

Convert 1,000,000 kilohertz to gigahertz:

What is the electromagnetic spectrum range from kHz to GHz?

ELF (extremely low frequency) is below 3 kHz, used for submarine communications. VLF (very low) is 3 to 30 kHz, used for time signals (WWVB at 60 kHz). LF (low) is 30 to 300 kHz, for AM longwave radio. MF (medium) is 300 kHz to 3 MHz, the AM broadcast band (540 to 1700 kHz). HF (high) is 3 to 30 MHz, shortwave and ham radio. VHF (very high) is 30 to 300 MHz, FM radio (88 to 108 MHz) and TV channels 2-13. UHF (ultra high) is 300 MHz to 3 GHz, including 4G LTE (700 to 2700 MHz), WiFi (2.4 GHz, 5 GHz, 6 GHz). SHF (super high) is 3 to 30 GHz, including 5G mmWave (24 to 71 GHz) and satellite C-band (4 to 8 GHz).

How does CPU clock speed in GHz relate to actual processing speed?

A 3 GHz CPU clock means 3 billion cycles per second. But CPU 'speed' is more than clock rate: it depends on instructions per cycle (IPC), cache hit rate, branch prediction, and parallelism. A modern 4 GHz Ryzen 9 might execute 4 to 8 instructions per cycle on hot loops, totaling 16 to 32 billion IPS in best case. Older 3 GHz Pentium 4 (2002 era) managed only 1 to 2 IPC, so 3 to 6 billion IPS. This is why a modern smartphone at 2.5 GHz outperforms a 3 GHz desktop from 2005: architectural improvements matter more than clock rate. For comparison, the original 4.77 MHz IBM PC (0.00000477 GHz) executed about 0.3 million instructions per second.

Why is WiFi at 2.4 GHz, 5 GHz, and 6 GHz, but not other frequencies?

These bands are licensed ISM (industrial, scientific, medical) bands set by ITU and FCC. 2.4 GHz (2400 to 2483.5 MHz) has long range (300 ft in open air) but is congested (Bluetooth, microwave ovens, baby monitors). 5 GHz (5150 to 5850 MHz across multiple sub-bands) has 24 non-overlapping 20-MHz channels with less congestion but shorter range (100 ft) due to higher absorption by walls and water. 6 GHz (5925 to 7125 MHz, opened in 2020 as WiFi 6E) adds 1200 MHz of clean spectrum, supporting 7 contiguous 160-MHz channels. The trade-off is fundamental: higher frequency means more bandwidth and shorter range. Other bands like 900 MHz are reserved for cellular and IoT (LoRa, Z-Wave).

How are audio frequencies (Hz, kHz) connected to RF frequencies (MHz, GHz)?

Audio is essentially the same physics, just at lower frequencies. Human hearing covers about 20 Hz to 20 kHz. Audio CDs sample at 44.1 kHz to capture the 22.05 kHz Nyquist limit (must sample at twice the highest frequency to reconstruct). Hi-res audio uses 96 or 192 kHz. RF engineering jumps from this base by factors of millions to gigahertz. The mathematics is identical: a 2.4 GHz signal is a sine wave oscillating 2.4 billion times per second, just like a 1 kHz audio tone oscillates 1000 times per second. Modulation techniques (AM, FM, QAM, OFDM) work across frequency scales but with vastly different antenna sizes (1/4 wavelength = 31.25 cm at 240 MHz, 1.25 cm at 6 GHz).

Why is 5G mmWave at frequencies as high as 71 GHz, and what are the trade-offs?

5G mmWave operates in the 24 to 71 GHz range to access 800 MHz to 8 GHz of contiguous bandwidth, enabling multi-gigabit speeds. The fundamental trade-off is propagation: at 28 GHz, signal range is 200 m or less in open air, and is blocked by walls, leaves, and even hands holding the phone. To compensate, 5G uses beamforming with multiple antennas to dynamically steer the signal toward the user. Carriers in the US deploy 5G mmWave at stadium and downtown densities; rural and suburban 5G uses sub-6 GHz (low and mid bands at 600 MHz, 2.5 GHz, 3.5 GHz) for better range. The kHz unit is meaningless at these scales, so RF data sheets always use GHz or MHz.

What is the speed of light and wavelength relationship at GHz frequencies?

Wavelength equals speed of light divided by frequency. Speed of light is approximately 3e8 m/s in vacuum. At 1 kHz, wavelength is 300,000 m (300 km), comparable to longwave radio. At 1 MHz (1000 kHz), wavelength is 300 m. At 1 GHz (1,000,000 kHz), wavelength is 30 cm. At 5 GHz, wavelength is 6 cm. At 60 GHz (the WiGig band), wavelength is 5 mm. This drives antenna design: a quarter-wave antenna at 5 GHz is 1.5 cm long, fitting easily inside a phone, while a quarter-wave at 1 MHz would need 75 meters of wire. mmWave (millimeter wave) gets its name because wavelengths fall below 10 mm at 30 GHz and above.

Kilohertz to gigahertz conversion table