Megahertz to Hertz (MHz to Hz)
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Megahertz-to-hertz conversions translate MHz-display FM-radio, TV-broadcasting, and amateur-radio band-allocations into hertz precision needed for transmitter-frequency primary documentation, atomic-clock cross-references, and underlying engineering-physics calculations. A 100 MHz FM-radio mid-band rolls down to 100,000,000 Hz on the transmitter-frequency primary; a 14 MHz amateur-radio 20m HF band-edge rolls down to 14,000,000 Hz on the transmitter-precision primary; a 9192.631770 MHz Cs-133 atomic-clock primary-standard frequency rolls down to 9,192,631,770 Hz on the SI second-definition primary. The math is a clean six-decimal-place shift the other way (1 MHz = 1,000,000 Hz).
How to convert Megahertz to Hertz
Formula
Hz = MHz × 1000000
To convert megahertz to hertz, multiply the MHz figure by 1,000,000 — equivalently, shift the decimal six places to the right. The relationship is exact in metric SI and is fixed by the SI prefix system. For mental math, "MHz × 10⁶" or "shift decimal 6 places" lands the Hz figure cleanly: 1 MHz is 1,000,000 Hz, 100.5 MHz is 100,500,000 Hz, 14 MHz is 14,000,000 Hz. The conversion is one of the larger within-SI scale jumps in everyday work, particularly common in FM-radio MHz-consumer-tuning to Hz-transmitter-primary, HF-amateur-radio MHz-band-allocation to Hz-transmitter-precision, Cs-133 atomic-clock MHz-engineering-reference to Hz-SI-primary, and medical-ultrasound MHz-clinical to Hz-transducer-engineering work.
Worked examples
Example 1 — 1 MHz
One megahertz equals exactly 1,000,000 hertz by SI prefix definition. The millionfold ratio is fixed by the SI prefix system and is exact across every modern frequency-measurement context.
Example 2 — 100.5 MHz
One hundred point five megahertz — a typical FM-radio mid-band-frequency — converts to 100,500,000 Hz on the transmitter-frequency primary. The MHz-figure is the consumer-tuning display; the Hz-figure is the underlying FCC, OFCOM, or CEPT-registered transmitter-frequency primary documentation.
Example 3 — 9192.63177 MHz
Nine thousand one hundred and ninety-two point six three one seven seven zero megahertz — the Cs-133 hyperfine-transition cross-disciplinary engineering reference — converts to exactly 9,192,631,770 Hz, the SI second-definition primary standard. This exact figure underlies every SI unit globally via the 1967 atomic-second standard.
MHz to Hz conversion table
| MHz | Hz |
|---|---|
| 1 MHz | 1000000 Hz |
| 2 MHz | 2000000 Hz |
| 3 MHz | 3000000 Hz |
| 4 MHz | 4000000 Hz |
| 5 MHz | 5000000 Hz |
| 6 MHz | 6000000 Hz |
| 7 MHz | 7000000 Hz |
| 8 MHz | 8000000 Hz |
| 9 MHz | 9000000 Hz |
| 10 MHz | 10000000 Hz |
| 15 MHz | 15000000 Hz |
| 20 MHz | 20000000 Hz |
| 25 MHz | 25000000 Hz |
| 30 MHz | 30000000 Hz |
| 40 MHz | 40000000 Hz |
| 50 MHz | 50000000 Hz |
| 75 MHz | 75000000 Hz |
| 100 MHz | 100000000 Hz |
| 150 MHz | 150000000 Hz |
| 200 MHz | 200000000 Hz |
| 250 MHz | 250000000 Hz |
| 500 MHz | 500000000 Hz |
| 750 MHz | 750000000 Hz |
| 1000 MHz | 1000000000 Hz |
| 2500 MHz | 2500000000 Hz |
| 5000 MHz | 5000000000 Hz |
Common MHz to Hz conversions
- 0.5 MHz=500000 Hz
- 1 MHz=1000000 Hz
- 5 MHz=5000000 Hz
- 14 MHz=14000000 Hz
- 27 MHz=27000000 Hz
- 88 MHz=88000000 Hz
- 100 MHz=100000000 Hz
- 500 MHz=500000000 Hz
- 1000 MHz=1000000000 Hz
- 9192.632 MHz=9192632000 Hz
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 Hertz?
The hertz (Hz) is the SI-derived unit of frequency, equal to one cycle, oscillation, or event per second of time (1 Hz = 1/s). The hertz is anchored to the SI second via the 1967 atomic-clock definition (Cs-133 hyperfine-transition at exactly 9,192,631,770 Hz). Higher-frequency multiples use kilohertz (kHz, 10³ Hz), megahertz (MHz, 10⁶ Hz), gigahertz (GHz, 10⁹ Hz), terahertz (THz, 10¹² Hz), and petahertz (PHz, 10¹⁵ Hz). The recognised SI symbol is "Hz" (uppercase H, honouring Heinrich Hertz). The unit is universally used across radio communication, audio engineering, computer-clock-rate specification, electric-power-grid frequency, mechanical-vibration analysis, atomic-spectroscopy, and any periodic-or-cyclic frequency context. The hertz is preserved across every modern frequency-measurement context globally and is the SI-canonical primary unit specified by ISO 80000-3 for technical writing.
The hertz is named after Heinrich Hertz (1857-1894), the German physicist whose 1886-1889 experiments at the University of Karlsruhe demonstrated the existence of electromagnetic waves predicted by Maxwell's equations, establishing the foundation of radio-frequency physics. Hertz constructed spark-gap transmitters and resonant-loop receivers to detect electromagnetic radiation at frequencies around 50-500 MHz, demonstrating reflection, refraction, polarisation, and standing-wave behaviour of radio waves. The unit "hertz" was formally adopted at the 14th CGPM in 1971 to name the SI-derived unit of frequency, equal to one cycle per second (1 Hz = 1/s = s⁻¹). The 2019 SI redefinition preserved the hertz definition as a derived unit anchored through the SI second to the Cs-133 hyperfine-transition atomic-clock primary standard. The hertz is universally used across radio communication, audio engineering, computer-clock-rate specification, electric-power-grid frequency, mechanical-vibration analysis, atomic-spectroscopy, and any context where periodic-or-cyclic frequency is the relevant physical quantity. Heinrich Hertz's original spark-gap experiments operated in the 50-500 MHz range, anticipating by decades the radio-and-television-broadcast frequency landscape that would emerge through the twentieth century.
Electric-power-grid frequency: every electric-power-grid globally specifies system frequency in hertz, with the major standards being 50 Hz (EU, UK, Asia outside Japan, Australia, Latin America, Africa) and 60 Hz (US, Canada, Mexico, parts of South America, Japan in part). Power-grid-frequency stability is critical for synchronous-generator coordination, with grid-frequency tolerance typically ±0.1 Hz under normal operating conditions. Audio engineering: human hearing spans 20 Hz to 20 kHz (with effective high-frequency response declining with age). Audio-equipment frequency response specifications denominate in Hz and kHz, with hi-fi-audio amplifiers and speakers typically specifying ±1 dB flatness from 20 Hz to 20 kHz. Audio-sampling rates use kHz figures (44.1 kHz CD audio, 48 kHz video-audio, 96 kHz hi-res audio). Computing and CPU clock-rates: every modern CPU clock-speed specifies in GHz, with typical commercial CPUs at 3-5 GHz peak boost frequencies. RAM-and-bus clock-frequencies use MHz and GHz. The hertz is the underlying unit for every clock-cycle measurement in computing. Radio frequency communication: every radio-frequency band globally specifies in kHz, MHz, GHz under ITU radio regulations. AM radio at 535-1605 kHz, FM radio at 88-108 MHz, mobile-cellular networks at 700 MHz to 6 GHz, WiFi at 2.4-6 GHz, satellite-communication at 1-30 GHz.
Real-world uses for Megahertz to Hertz
FM-radio MHz consumer-tuning display translated to Hz transmitter-frequency primary
FM-radio MHz consumer-tuning display figures translate to Hz precision for the underlying transmitter-frequency primary documentation under FCC, OFCOM, and CEPT regulations across the 88-108 MHz VHF Band II FM allocation. A 100.5 MHz BBC Radio 1 consumer-tuning display rolls down to 100,500,000 Hz on the transmitter-frequency primary; an 88 MHz FM-band lower-edge rolls down to 88,000,000 Hz; a 108 MHz FM-band upper-edge rolls down to 108,000,000 Hz. The conversion runs at every FM-station consumer-tuning to transmitter-frequency-primary documentation step.
HF-amateur-radio MHz band-allocations translated to Hz transmitter-precision primary
HF amateur-radio MHz band-allocations under IARU and ITU regulations translate to Hz precision for the transmitter-precision primary documentation. A 14 MHz 20m-band lower-edge rolls down to 14,000,000 Hz; a 14.35 MHz upper-edge rolls down to 14,350,000 Hz. The conversion runs at every amateur-radio MHz-band-allocation to Hz-transmitter-precision step, with the MHz-figure on the band-allocation reference and the Hz-figure on the underlying transmitter-engineering primary.
Cs-133 MHz cross-disciplinary engineering reference translated to Hz SI second-definition primary
Cs-133 atomic-clock primary-standard cross-disciplinary engineering reference at 9192.631770 MHz translates to Hz precision for the SI second-definition primary documentation under the 1967 atomic-second standard. The 9192.631770 MHz cross-disciplinary engineering reference rolls down to exactly 9,192,631,770 Hz on the SI second-definition primary, with this exact figure being the foundational SI primary standard. The conversion runs at every atomic-clock cross-disciplinary engineering reference to SI-primary-standard documentation step.
Medical-ultrasound MHz clinical-imaging frequencies translated to Hz transducer-engineering primary
Medical-ultrasound MHz clinical-imaging frequencies (1-15 MHz typical clinical ultrasound across abdominal, cardiac, obstetric, and vascular examinations) translate to Hz precision for the underlying transducer-engineering primary documentation by transducer manufacturers (GE Healthcare, Philips, Siemens, Mindray, Samsung Medison). A 5 MHz cardiac-ultrasound frequency rolls down to 5,000,000 Hz on the transducer-engineering primary; a 12 MHz vascular-ultrasound rolls down to 12,000,000 Hz. The conversion runs at every medical-ultrasound clinical-imaging-spec to transducer-engineering primary documentation step.
When to use Hertz instead of Megahertz
Use hertz whenever the destination is the underlying transmitter-frequency primary documentation, atomic-clock primary-standard documentation, transducer-engineering primary, or any precision-source work where Hz granularity is the natural unit. Hertz is the universal SI base frequency unit specified by ISO 80000-3 for technical writing, anchored to the Cs-133 hyperfine-transition atomic-clock primary standard at exactly 9,192,631,770 Hz since the 1967 SI redefinition. Stay in megahertz when the destination is FM-radio band-allocation documentation, TV-broadcasting band-allocation, medical-ultrasound clinical-imaging frequency, amateur-radio HF-or-VHF band-allocation, or any context where MHz-scale granularity is more legible than Hz-precision. The conversion is the within-SI scale roll-down between MHz-display source and Hz-precision destination engineering documentation.
Common mistakes converting MHz to Hz
- Confusing megahertz-to-hertz (multiply by 1,000,000) with megahertz-to-kilohertz (multiply by 1000). Both are within-SI scale conversions but at different scale steps. The MHz-to-Hz step is multiply-by-1,000,000; the MHz-to-kHz step is multiply-by-1000. Mixing them up gives a thousandfold error.
- Skipping the decimal-shift count in mental math. A "MHz × 10⁵" gives a tenfold-too-small Hz result; a "MHz × 10⁷" gives a tenfold-too-large Hz result. The correct decimal shift is six places (10⁶), and getting the count wrong is a common error in within-SI scale-ladder conversions.
Frequently asked questions
How many Hz in 1 MHz?
One megahertz contains exactly 1,000,000 hertz (10⁶ Hz) by SI prefix definition — the canonical MHz-to-Hz roll-down reference for radio-frequency engineering. Each MHz-display consumer-tuning figure rolls down to the corresponding Hz-precision underlying transmitter-frequency primary via the millionfold multiplier. The exact relationship is preserved across FM-radio, HF-amateur-radio, atomic-clock-metrology, and medical-ultrasound documentation chains.
How many Hz in 100.5 MHz (a typical FM station)?
One hundred point five megahertz equals 100,500,000 Hz. That is a typical FM-radio mid-band-frequency translated to the underlying transmitter-frequency primary documentation, with the MHz-figure on the consumer-tuning display and the Hz-figure on the underlying FCC, OFCOM, or CEPT-registered transmitter-frequency primary. The conversion is exact via the millionfold SI prefix factor.
How many Hz in 9192.631770 MHz (Cs-133 atomic clock)?
Nine thousand one hundred and ninety-two point six three one seven seven zero megahertz equals exactly 9,192,631,770 Hz — the SI second-definition primary standard. This exact figure underlies every SI unit globally via the 1967 atomic-second standard, making the Cs-133 hyperfine-transition the foundational frequency reference for modern timekeeping and precision metrology. Caesium-fountain primary atomic clocks at NIST, NPL, PTB, and NMIJ achieve precision better than 1 part in 10^15 against this exact figure.
Quick way to convert MHz to Hz in my head?
Shift the decimal six places to the right, or multiply by 1,000,000. For 1 MHz that gives 1,000,000 Hz, for 100.5 MHz that gives 100,500,000 Hz, for 14 MHz that gives 14,000,000 Hz. The six-place shift is at the edge of comfortable mental-decimal-place tracking — most users prefer to compute via the intermediate kHz step (MHz × 1000 to kHz, then kHz × 1000 to Hz).
How does MHz-to-Hz relate to GHz-to-Hz?
Megahertz-to-hertz multiplies by 1,000,000 (10⁶); gigahertz-to-hertz multiplies by 1,000,000,000 (10⁹). The two conversions differ by a factor of 1000 because the GHz scale is a thousand-times higher than the MHz scale. A 5 GHz CPU clock-rate equals 5 × 10⁹ Hz = 5,000,000,000 Hz on the underlying CPU clock-cycle primary.
When does MHz-to-Hz appear in real work?
Mhz-to-Hz appears in FM-radio MHz consumer-tuning display translated to Hz transmitter-frequency primary, HF-amateur-radio MHz band-allocations translated to Hz transmitter-precision primary, Cs-133 MHz cross-disciplinary engineering reference translated to Hz SI second-definition primary, and medical-ultrasound MHz clinical-imaging frequencies translated to Hz transducer-engineering primary. The conversion is uncommon in everyday consumer work but routine in radio-engineering and atomic-clock metrology contexts. Each case rolls down MHz consumer-display references to Hz precision-engineering primary.
How precise should MHz-to-Hz be for atomic-clock work?
For atomic-clock primary-standard work the MHz-to-Hz conversion is exact (1 MHz = 1,000,000 Hz), with the underlying atomic-clock measurement precision (1 part in 10^15 for caesium-fountain) preserved through the conversion. The Hz-figure on SI-primary-standard documentation rolls down cleanly without introducing additional rounding error, with the exact 9,192,631,770 Hz figure for the Cs-133 hyperfine transition being foundational to the SI system. The factor is universal across modern frequency measurement.