Gigahertz to Megahertz (GHz to MHz)
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Gigahertz-to-megahertz conversions translate GHz-display modern-CPU clock-rates, mobile-cellular band-allocations, WiFi band references, and satellite-communication band figures into MHz precision needed for ITU radio-regulation engineering-spec primary documentation, fine-channel-allocation specs, and cross-band reference to FM-radio and TV-broadcasting frequency landscapes. A 5 GHz modern-CPU clock-rate rolls down to 5000 MHz on the underlying clock-rate primary; a 2.4 GHz WiFi-band rolls down to 2400 MHz on the ITU radio-regulation engineering-spec; a 3.5 GHz 5G NR Band n78 rolls down to 3500 MHz on the 3GPP engineering documentation. The math is a clean three-decimal-place shift the other way (1 GHz = 1000 MHz).
How to convert Gigahertz to Megahertz
Formula
MHz = GHz × 1000
To convert gigahertz to megahertz, multiply the GHz figure by 1000 — equivalently, shift the decimal three places to the right. The relationship is exact in metric SI and is fixed by the SI prefix system, with the giga- prefix at exactly 1000 times the mega- prefix. For mental math, "GHz × 1000" lands the MHz figure cleanly: 1 GHz is 1000 MHz, 2.4 GHz is 2400 MHz, 5.5 GHz is 5500 MHz. The conversion runs at every GHz-display-source to MHz-precision-destination boundary across consumer-router WiFi-band-label to ITU-engineering-spec, modern-CPU consumer-marketing to internal-clock-rate primary, 5G NR consumer-marketing to 3GPP engineering documentation, and satellite-communication GHz-band-reference to MHz-channel-allocation primary.
Worked examples
Example 1 — 1 GHz
One gigahertz equals exactly 1000 megahertz by SI prefix definition. That is the canonical GHz-to-MHz reference roll-down.
Example 2 — 2.4 GHz
Two point four gigahertz — the WiFi 2.4-GHz-band lower-edge — converts to 2400 MHz on the ITU radio-regulation engineering-spec primary. That is the figure on the FCC, OFCOM, and CEPT WiFi engineering-spec documentation, with the GHz-figure on the consumer-router label and the MHz-figure on the underlying engineering-spec primary.
Example 3 — 5.5 GHz
Five point five gigahertz — a typical Intel Core i9 peak-boost frequency — converts to 5500 MHz on the underlying CPU internal-clock-rate primary engineering documentation. The GHz-figure is the consumer-marketing label; the MHz-figure is the engineering-spec primary.
GHz to MHz conversion table
| GHz | MHz |
|---|---|
| 1 GHz | 1000 MHz |
| 2 GHz | 2000 MHz |
| 3 GHz | 3000 MHz |
| 4 GHz | 4000 MHz |
| 5 GHz | 5000 MHz |
| 6 GHz | 6000 MHz |
| 7 GHz | 7000 MHz |
| 8 GHz | 8000 MHz |
| 9 GHz | 9000 MHz |
| 10 GHz | 10000 MHz |
| 15 GHz | 15000 MHz |
| 20 GHz | 20000 MHz |
| 25 GHz | 25000 MHz |
| 30 GHz | 30000 MHz |
| 40 GHz | 40000 MHz |
| 50 GHz | 50000 MHz |
| 75 GHz | 75000 MHz |
| 100 GHz | 100000 MHz |
| 150 GHz | 150000 MHz |
| 200 GHz | 200000 MHz |
| 250 GHz | 250000 MHz |
| 500 GHz | 500000 MHz |
| 750 GHz | 750000 MHz |
| 1000 GHz | 1000000 MHz |
| 2500 GHz | 2500000 MHz |
| 5000 GHz | 5000000 MHz |
Common GHz to MHz conversions
- 0.5 GHz=500 MHz
- 0.7 GHz=700 MHz
- 1 GHz=1000 MHz
- 2.4 GHz=2400 MHz
- 2.6 GHz=2600 MHz
- 3.5 GHz=3500 MHz
- 5 GHz=5000 MHz
- 5.5 GHz=5500 MHz
- 6 GHz=6000 MHz
- 28 GHz=28000 MHz
What is a Gigahertz?
The gigahertz (GHz) is exactly 1,000,000,000 hertz (10⁹ Hz) by SI prefix definition. The relationship is fixed and exact, with the giga- prefix denoting 10⁹ of the underlying unit. One GHz equals 1 billion cycles per second. The recognised SI symbol is "GHz", with uppercase "G" SI prefix and uppercase "Hz" honouring Heinrich Hertz. Higher-frequency multiples use terahertz (THz, 10¹² Hz) for far-infrared, astronomical and atomic-clock optical-transition spectroscopy work, and petahertz (PHz, 10¹⁵ Hz) for ultraviolet light frequencies. The gigahertz is the dominant modern frequency unit for CPU clock-rates (typical 3-5 GHz peak boost), mobile-cellular communication (0.6-6 GHz mid-band, 24-39 GHz mmWave 5G), WiFi (2.4, 5, 6 GHz), and satellite-communication (1-40 GHz across L through Ka bands).
The gigahertz emerged with the hertz fixed by the SI prefix system, becoming dominant in modern computing CPU clock-rates (since the late 1990s GHz-transition, with Intel Pentium 4 launching in 2000 at 1.5 GHz), mobile-cellular communication (2G GSM at 0.9-1.8 GHz, 3G UMTS at 0.9-2.1 GHz, 4G LTE at 0.7-2.6 GHz, 5G NR at 0.6-6 GHz mid-band and 24-39 GHz mmWave), WiFi (2.4 GHz original, 5 GHz since 802.11a, 6 GHz since 6E), and satellite-communication (Ku-band 12-18 GHz, Ka-band 26-40 GHz). The GHz dominates modern radio-frequency engineering for everything operating above the legacy AM-FM-and-TV broadcast bands. The 2019 SI redefinition preserved the gigahertz via the second-anchored SI definition, with the underlying Cs-133 hyperfine-transition primary standard at exactly 9.192631770 GHz providing the foundational frequency reference for all SI units. Modern GHz-frequency engineering spans CPU clock-rates, mobile-cellular communication, WiFi, satellite-communication, and radar-systems across every modern computing-and-communications context globally. The GHz-frequency landscape continues to expand into mmWave 5G, terahertz astronomical and atomic-spectroscopy, and optical-frequency atomic-clock work at the precision-physics frontier.
Modern computing CPU clock-rates: every modern CPU clock-speed specifies in GHz on consumer-facing marketing materials and engineering specs. Typical desktop and laptop CPUs at 3-5 GHz peak boost frequencies, with the highest production CPUs around 5.5-6 GHz. RAM clock-speeds use MHz and GHz (DDR4 at 1.6-3.2 GHz effective, DDR5 at 4-8 GHz effective). Mobile-cellular communication: 4G LTE bands span 0.7-2.6 GHz globally; 5G NR sub-6 GHz bands span 0.6-6 GHz; 5G mmWave bands at 24-39 GHz for ultra-high-bandwidth urban-coverage applications. Every mobile carrier worldwide operates within these GHz-frequency bands under ITU radio regulations. WiFi: WiFi 4 (802.11n) and WiFi 5 (802.11ac) use 2.4 GHz and 5 GHz; WiFi 6 (802.11ax) adds 6 GHz with WiFi 6E for the additional 1200 MHz of 6 GHz spectrum (US since 2020, EU since 2021, UK since 2020). Typical home-router speeds 100 Mbps to 10 Gbps depending on standard and band. Satellite-communication: geostationary commercial satellites operate in C-band (4-8 GHz), Ku-band (12-18 GHz), Ka-band (26-40 GHz). Starlink LEO satellite-internet uses Ku-band 10.7-12.7 GHz downlink, 14-14.5 GHz uplink, and Ka-band 17.8-19.3 GHz / 27.5-30 GHz for the gateway-and-customer terminals. Radar systems: airport surveillance radar at 2.7-2.9 GHz S-band, weather radar at 5.6-5.65 GHz C-band or 9.4 GHz X-band, marine radar at 9.4 GHz X-band.
What is a Megahertz?
The megahertz (MHz) is exactly 1,000,000 hertz (10⁶ Hz) by SI prefix definition. The relationship is fixed and exact, with the mega- prefix denoting 10⁶ of the underlying unit. One MHz equals 1,000,000 cycles per second. The recognised SI symbol is "MHz", with uppercase "M" SI prefix and uppercase "Hz" honouring Heinrich Hertz. The case-sensitive prefix distinction is critical: "MHz" (mega-, 10⁶) versus "mHz" (milli-, 10⁻³) — the two differ by a billion-fold and substituting one for the other gives wildly wrong results. The megahertz is the standard everyday-engineering frequency unit for FM radio (88-108 MHz), TV broadcasting (470-694 MHz UHF), legacy CPU clocks (1-1000 MHz era 1980s-1990s), medical ultrasound (1-15 MHz), and amateur radio (1.8-148 MHz).
The megahertz emerged with the hertz fixed by the SI prefix system. The unit dominates FM radio broadcasting globally — every FM radio station worldwide operates in the 88-108 MHz VHF Band II under ITU radio regulations. The MHz is also dominant in TV broadcasting (legacy NTSC/PAL/SECAM TV at 54-806 MHz UHF/VHF bands, modern digital-TV at 470-694 MHz UHF), legacy CPU clock-rates (1980s-1990s era CPUs at 1-100 MHz, before the MHz-to-GHz transition in the late 1990s), medical-ultrasound imaging (1-15 MHz typical clinical ultrasound), and amateur (ham) radio bands (HF and VHF allocations across 1.8-148 MHz). Wireless-radio and TV broadcasting standardised on MHz allocations through twentieth-century ITU radio-regulation development, with the modern global MHz-band landscape established by mid-twentieth-century international agreements that have remained largely stable since. The 2019 SI redefinition preserved the megahertz via the second-anchored SI definition, with the underlying Cs-133 hyperfine-transition primary atomic-clock standard providing the foundational frequency reference. Modern MHz-frequency engineering continues across radio-broadcast, TV-broadcast, medical-ultrasound and amateur-radio applications globally.
FM radio broadcasting universally: every FM radio station worldwide operates in the 88-108 MHz VHF Band II under ITU radio regulations. Typical FM stations occupy 200 kHz channels (US, Canada) or 100 kHz channels (rest of world). FM-radio digital DAB and HD Radio overlay legacy FM bands. TV broadcasting: legacy analogue NTSC/PAL/SECAM TV at 54-806 MHz UHF/VHF bands. Modern digital-TV (DVB-T in EU, ATSC in US, ISDB in Japan/Brazil) at 470-694 MHz UHF after the 600 MHz spectrum re-farming for 5G in the US (since 2017) and the 700 MHz re-farming in EU (since 2020). Medical-ultrasound imaging: clinical ultrasound (abdominal, cardiac, obstetric, vascular) operates at 1-15 MHz frequency, with low-frequency 1-3 MHz for deep abdominal imaging and high-frequency 7-15 MHz for shallow vascular and musculoskeletal imaging. Legacy CPU clock-rates: 1980s-1990s era CPUs at 1-1000 MHz (Intel 8086 at 5-10 MHz in 1978, Intel Pentium at 60-300 MHz in 1993-1999, Intel Pentium III at 450-1400 MHz in 1999-2002 — the last era of MHz-rated CPUs before the GHz transition). Amateur (ham) radio bands: amateur radio worldwide operates across HF (1.8-30 MHz), VHF (30-300 MHz), and UHF (300-3000 MHz) bands under ITU and national-jurisdiction amateur-radio regulations.
Real-world uses for Gigahertz to Megahertz
GHz consumer-router WiFi-band labels translated to MHz ITU radio-regulation engineering-spec
GHz consumer-router WiFi-band labels (2.4 GHz, 5 GHz, 6 GHz) translate to MHz precision for the underlying ITU radio-regulation engineering-spec primary documentation under FCC, OFCOM, and CEPT regulations. A 2.4 GHz WiFi-band rolls down to 2400 MHz on the ITU-radio-regulation engineering-spec; a 5 GHz WiFi-band rolls down to 5000 MHz; a 6 GHz WiFi 6E band rolls down to 6000 MHz. The conversion runs at every consumer-router product label to ITU-engineering-spec documentation step.
GHz modern-CPU consumer-marketing translated to MHz internal-clock-rate primary
GHz modern-CPU consumer-marketing materials (typical 3.5-5.5 GHz peak boost) translate to MHz precision for the underlying CPU internal-clock-rate primary engineering documentation. A 5.5 GHz Intel Core i9 peak-boost rolls down to 5500 MHz on the engineering primary; a 4.5 GHz AMD Ryzen 9 peak-boost rolls down to 4500 MHz. The conversion runs at every CPU consumer-marketing to engineering-spec primary step.
5G NR GHz band allocations translated to MHz 3GPP engineering documentation
5G NR sub-6 GHz band allocations under 3GPP Release 15+ standards translate from GHz consumer-marketing to MHz precision for the 3GPP engineering documentation. A 3.5 GHz 5G NR Band n78 rolls down to 3500 MHz on the 3GPP engineering documentation; a 2.6 GHz 5G NR Band n7 rolls down to 2600 MHz; a 0.7 GHz 5G NR Band n28 rolls down to 700 MHz. The conversion runs at every 5G NR consumer-marketing to 3GPP engineering-spec step.
Satellite-communication GHz band references translated to MHz channel-allocation primary
Satellite-communication GHz band references (C-band at 4-8 GHz, Ku-band 12-18 GHz, Ka-band 26-40 GHz, V-band 40-75 GHz) translate to MHz precision for the underlying channel-allocation primary documentation under ITU radio regulations. A 12 GHz Ku-band lower-edge rolls down to 12,000 MHz; a 28 GHz Ka-band 5G mmWave Band n261 rolls down to 28,000 MHz; a 39 GHz Ka-band 5G mmWave Band n260 rolls down to 39,000 MHz. The conversion runs at every satellite-communication GHz-band-reference to MHz-channel-allocation engineering documentation step.
When to use Megahertz instead of Gigahertz
Use megahertz whenever the destination is the underlying ITU radio-regulation engineering-spec primary documentation, CPU internal-clock-rate primary, 3GPP engineering-spec documentation, satellite-communication channel-allocation primary, or any precision-source work where MHz granularity is the natural unit. Megahertz are the standard ITU-radio-regulation engineering-spec primary across modern WiFi, mobile-cellular, satellite-communication, and CPU clock-rate documentation, with channel-and-band-allocation precision running at the MHz level under FCC, OFCOM, CEPT, and 3GPP regulations. Stay in gigahertz when the destination is consumer-WiFi-router product label, modern-CPU consumer-marketing material, mobile-cellular consumer-marketing reference, satellite-communication band-allocation, or any context where GHz-scale granularity is more legible than MHz-precision. The conversion is the within-SI scale roll-down between GHz-display source and MHz-precision destination engineering documentation.
Common mistakes converting GHz to MHz
- Skipping the multiply-by-1000 step and treating GHz and MHz as numerically equivalent. The two units differ by a factor of 1000. A "5 GHz" CPU treated as "5 MHz" would be a thousand-times-slower legacy 1980s-era CPU, in error by three orders of magnitude.
- Confusing GHz-to-MHz (multiply by 1000) with GHz-to-kHz (multiply by 1,000,000). Both are within-SI scale conversions but at different scale steps. Mixing them up gives a thousandfold error.
Frequently asked questions
How many MHz in 1 GHz?
One gigahertz equals exactly 1000 megahertz by SI prefix definition. The thousandfold ratio is fixed and unchanging across every modern frequency-measurement context. The "1 GHz = 1000 MHz" reference is the canonical radio-frequency and CPU-clock-rate cross-band conversion factor.
How many MHz in 2.4 GHz (WiFi)?
Two point four gigahertz equals 2.4 × 1000 = 2400 MHz. That is the WiFi 2.4-GHz-band lower-edge translated to the ITU radio-regulation engineering-spec primary documentation, with the GHz-figure on the consumer-router product label and the MHz-figure on the underlying ITU-engineering-spec primary.
How many MHz in 5.5 GHz (a high-end CPU)?
Five point five gigahertz equals 5.5 × 1000 = 5500 MHz. That is a typical Intel Core i9 peak-boost frequency translated to the underlying CPU internal-clock-rate primary engineering documentation, with the GHz-figure on the consumer-marketing label and the MHz-figure on the engineering-spec primary.
Quick way to convert GHz to MHz in my head?
Multiply the GHz figure by 1000 — a three-decimal-place shift to the right. For 1 GHz that gives 1000 MHz, for 2.4 GHz that gives 2400 MHz, for 5.5 GHz that gives 5500 MHz. The conversion is one of the cleanest mental-math operations in metric frequency measurement.
How does GHz relate to mobile-cellular bands?
Mobile-cellular bands span 0.6-6 GHz sub-6 (4G LTE and 5G NR mid-band) and 24-39 GHz mmWave (5G NR Band n261 at 28 GHz, n260 at 39 GHz). Each band is allocated specific MHz channel-precision under 3GPP and ITU radio regulations. A 3.5 GHz 5G NR Band n78 rolls down to 3500 MHz on the 3GPP engineering spec, with specific MHz channel-allocations within that band-edge range.
When does GHz-to-MHz appear in real work?
Ghz-to-MHz appears in GHz consumer-router WiFi-band labels translated to MHz ITU radio-regulation engineering-spec, GHz modern-CPU consumer-marketing translated to MHz internal-clock-rate primary, 5G NR GHz band allocations translated to MHz 3GPP engineering documentation, and satellite-communication GHz band references translated to MHz channel-allocation primary. The conversion is one of the most-run within-SI frequency conversions in modern computing-and-communications engineering. Each case rolls down GHz consumer-display references to MHz engineering-spec primary.
How precise should GHz-to-MHz be for ITU engineering work?
For ITU radio-regulation engineering-spec primary documentation the GHz-to-MHz conversion is exact (1 GHz = 1000 MHz), and the precision allowance comes from the underlying source-measurement precision. The MHz-figure on engineering-spec primary documentation rolls down cleanly without introducing additional rounding error at the conversion step. The factor is universal across modern frequency measurement.