Megahertz to Gigahertz (MHz to GHz)
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Megahertz-to-gigahertz conversions translate MHz-display FM-radio, TV-broadcasting, and legacy CPU-clock-rate figures into the GHz used for modern computing CPU clock-rates, mobile-cellular communication, WiFi, and satellite-communication. A 2400 MHz WiFi 2.4-GHz-band frequency rolls up to 2.4 GHz on the consumer-WiFi-router product label; a 5000 MHz computing CPU clock-rate rolls up to 5 GHz on the modern CPU consumer marketing; a 1500 MHz legacy Pentium CPU clock rolls up to 1.5 GHz on the CPU spec-sheet. The factor is a clean three-decimal-place shift in metric SI (1 GHz = 1000 MHz).
How to convert Megahertz to Gigahertz
Formula
GHz = MHz × 0.001
To convert megahertz to gigahertz, multiply the MHz figure by 0.001 — equivalently, divide by 1000, or shift the decimal three places to the left. 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, "MHz ÷ 1000" lands the GHz figure cleanly: 1000 MHz is 1 GHz, 2400 MHz is 2.4 GHz, 5500 MHz is 5.5 GHz. The conversion is one of the cleanest in modern frequency measurement and runs constantly across WiFi MHz-engineering-spec to GHz-consumer-router-label, modern-CPU MHz-internal-clock to GHz-consumer-marketing, legacy-CPU MHz cross-generation reference, and mobile-cellular MHz-band-allocation to GHz-consumer-marketing work.
Worked examples
Example 1 — 1000 MHz
One thousand megahertz equals exactly 1 GHz by SI prefix definition. The thousandfold ratio is fixed by the SI prefix system and is exact across every modern frequency-measurement context.
Example 2 — 2400 MHz
Two thousand four hundred megahertz — the WiFi 2.4-GHz-band lower-edge — converts to 2.4 GHz on the consumer-WiFi-router product label. That is the figure on every WiFi router consumer marketing for the 2.4 GHz band, with the MHz-figure on the underlying ITU-radio-regulation engineering-spec and the GHz-figure on the consumer-router label.
Example 3 — 5500 MHz
Five thousand five hundred megahertz — a typical Intel Core i9 peak-boost frequency — converts to 5.5 GHz on the consumer marketing. That is the figure on every CPU consumer-spec sheet for high-end modern CPUs, with the MHz-figure on the underlying clock-rate primary and the GHz-figure on the consumer-facing marketing label.
MHz to GHz conversion table
| MHz | GHz |
|---|---|
| 1 MHz | 0.001 GHz |
| 2 MHz | 0.002 GHz |
| 3 MHz | 0.003 GHz |
| 4 MHz | 0.004 GHz |
| 5 MHz | 0.005 GHz |
| 6 MHz | 0.006 GHz |
| 7 MHz | 0.007 GHz |
| 8 MHz | 0.008 GHz |
| 9 MHz | 0.009 GHz |
| 10 MHz | 0.01 GHz |
| 15 MHz | 0.015 GHz |
| 20 MHz | 0.02 GHz |
| 25 MHz | 0.025 GHz |
| 30 MHz | 0.03 GHz |
| 40 MHz | 0.04 GHz |
| 50 MHz | 0.05 GHz |
| 75 MHz | 0.075 GHz |
| 100 MHz | 0.1 GHz |
| 150 MHz | 0.15 GHz |
| 200 MHz | 0.2 GHz |
| 250 MHz | 0.25 GHz |
| 500 MHz | 0.5 GHz |
| 750 MHz | 0.75 GHz |
| 1000 MHz | 1 GHz |
| 2500 MHz | 2.5 GHz |
| 5000 MHz | 5 GHz |
Common MHz to GHz conversions
- 100 MHz=0.1 GHz
- 500 MHz=0.5 GHz
- 1000 MHz=1 GHz
- 1500 MHz=1.5 GHz
- 2400 MHz=2.4 GHz
- 2600 MHz=2.6 GHz
- 3500 MHz=3.5 GHz
- 5000 MHz=5 GHz
- 5500 MHz=5.5 GHz
- 28000 MHz=28 GHz
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.
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.
Real-world uses for Megahertz to Gigahertz
WiFi MHz channel frequencies rolled up to GHz consumer-router product labels
WiFi consumer-router product labels denominate frequency in GHz for the consumer-facing band reference (2.4 GHz, 5 GHz, 6 GHz WiFi 6E), but the underlying engineering-spec channel-frequency primary is in MHz precision. A 2412 MHz WiFi 2.4-GHz-band Channel 1 rolls up to 2.412 GHz; a 5180 MHz WiFi 5-GHz-band Channel 36 rolls up to 5.18 GHz. The conversion runs at every WiFi engineering-spec to consumer-router product-label step.
Modern CPU MHz internal-clock-rate documentation rolled up to GHz consumer marketing
Modern CPU clock-rate primary documentation in MHz (typical 3500-5500 MHz peak boost) rolls up to GHz for consumer-facing CPU marketing materials. A 5500 MHz Intel Core i9 peak-boost frequency rolls up to 5.5 GHz on the consumer marketing; a 4500 MHz AMD Ryzen 9 peak-boost rolls up to 4.5 GHz. The conversion runs at every CPU engineering-spec to consumer-marketing step, with the MHz-figure on the underlying clock-rate primary and the GHz-figure on the consumer-facing marketing label.
Legacy CPU MHz clock-rates rolled up to GHz cross-generation reference
Legacy CPU clock-rates from the 1980s-1990s era (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) cross-reference to GHz for modern-CPU comparison. A 1400 MHz Pentium III rolls up to 1.4 GHz on the cross-generation reference; a 200 MHz original Pentium rolls up to 0.2 GHz. The conversion runs at every legacy-vs-modern CPU comparison documentation step.
Mobile-cellular MHz band-allocation primary rolled up to GHz consumer-marketing references
Mobile-cellular MHz band-allocation primary documentation under ITU-and-3GPP standards rolls up to GHz for consumer-marketing references. A 700 MHz 4G LTE Band 12/17 (US) or 4G LTE Band 28 (EU) rolls up to 0.7 GHz on the consumer-cellular marketing; a 2600 MHz 4G LTE Band 7 (EU) rolls up to 2.6 GHz; a 3500 MHz 5G NR Band n78 (mid-band) rolls up to 3.5 GHz. The conversion runs at every mobile-cellular engineering-spec to consumer-marketing step.
When to use Gigahertz instead of Megahertz
Use gigahertz whenever the destination is a 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. Gigahertz are the universal modern computing-and-communications frequency unit globally for CPU clock-rates, mobile-cellular bands, WiFi, and satellite-communication contexts, with the dominant consumer-marketing scale for every modern computing and wireless-communications product. Stay in megahertz when the destination is FM-radio band-allocation, TV-broadcasting band-allocation, legacy CPU clock-rate spec, medical-ultrasound clinical-imaging frequency, amateur-radio HF-or-VHF band-allocation, or any context where MHz-scale granularity is the natural unit. The conversion is the within-SI scale roll-up between MHz-precision source and GHz-display destination engineering documentation.
Common mistakes converting MHz to GHz
- Confusing MHz-to-GHz (divide by 1000) with MHz-to-kHz (multiply by 1000). Both are within-SI scale conversions but in opposite directions. The MHz-to-GHz step is divide-by-1000; the MHz-to-kHz step is multiply-by-1000. Mixing them up gives a million-fold error.
- Reading "5500 MHz" as "5500 GHz" rather than 5.5 GHz. The "MHz" abbreviation is the megahertz prefix; the "GHz" abbreviation is the gigahertz prefix. The visual similarity of "5500 MHz" and "5500 GHz" can cause documentation errors when the prefix is misread, with a 1000-fold scale-shift between the two.
Frequently asked questions
How many GHz in 1000 MHz?
One thousand megahertz equals exactly 1 gigahertz by SI prefix definition. The thousandfold ratio is fixed and unchanging across every modern frequency-measurement context. The "1000 MHz = 1 GHz" reference is the canonical radio-frequency and CPU-clock-rate cross-band conversion factor.
How many GHz in 2400 MHz (WiFi 2.4 GHz)?
Two thousand four hundred megahertz equals 2.4 GHz. That is the WiFi 2.4-GHz-band lower-edge, the most-commonly-referenced WiFi frequency on consumer-router product labels. The MHz-figure is on the underlying ITU-radio-regulation engineering-spec; the GHz-figure is on the consumer-router consumer-marketing label.
How many GHz in 5500 MHz (a modern CPU)?
Five thousand five hundred megahertz equals 5.5 GHz. That is a typical Intel Core i9 peak-boost frequency on the consumer-CPU marketing material, with the MHz-figure on the underlying CPU engineering-spec primary and the GHz-figure on the consumer-marketing label.
Quick way to convert MHz to GHz in my head?
Divide the MHz figure by 1000 — a three-decimal-place shift to the left. For 1000 MHz that gives 1 GHz, for 2400 MHz that gives 2.4 GHz, for 5500 MHz that gives 5.5 GHz. The conversion is one of the cleanest mental-math operations in metric frequency measurement.
How does MHz relate to legacy CPU vs modern CPU clock-rates?
Legacy 1980s-1990s CPUs operated at MHz clock-rates (Intel 8086 at 5-10 MHz, Pentium at 60-300 MHz, Pentium III at 450-1400 MHz). The MHz-to-GHz transition came with the Intel Pentium 4 launch in 2000 at 1.5 GHz (1500 MHz). Modern CPUs run at 3500-5500 MHz peak boost, conventionally specified in GHz on consumer marketing (3.5-5.5 GHz).
When does MHz-to-GHz appear in real work?
Mhz-to-GHz appears in WiFi MHz channel frequencies rolled up to GHz consumer-router product labels, modern CPU MHz internal-clock-rate documentation rolled up to GHz consumer marketing, legacy CPU MHz clock-rates rolled up to GHz cross-generation reference, and mobile-cellular MHz band-allocation primary rolled up to GHz consumer-marketing references. The conversion is one of the most-run within-SI frequency conversions in modern computing-and-communications engineering. Each case rolls up MHz engineering-spec sources to GHz consumer-display destinations.
How precise should MHz-to-GHz be for engineering work?
For engineering work the MHz-to-GHz conversion is exact (1 GHz = 1000 MHz), and the precision allowance comes from the underlying source-measurement precision. The GHz-figure on consumer-marketing materials rolls up cleanly without introducing additional rounding error at the conversion step. The factor is universal across modern frequency measurement.