Hertz to Megahertz (Hz to MHz)
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Hertz-to-megahertz conversions translate Hz-precision low-frequency physics-and-mechanical-vibration figures into the MHz used for FM-radio, TV-broadcasting, medical-ultrasound, and amateur-radio engineering documentation. A 1,000,000 Hz mechanical-engineering high-frequency-vibration measurement converts to 1 MHz on the cross-disciplinary acoustic-engineering reference; a 100,000,000 Hz FM-radio centre-frequency converts to 100 MHz on the radio-engineering documentation; a 14,000,000 Hz HF amateur-radio 20m band-edge converts to 14 MHz. The factor is a clean six-decimal-place shift in metric SI (1 MHz = 1,000,000 Hz), one of the larger within-SI scale jumps in everyday work.
How to convert Hertz to Megahertz
Formula
MHz = Hz × 0.000001
To convert hertz to megahertz, multiply the Hz figure by 0.000001 — equivalently, divide by 1,000,000, or shift the decimal six places to the left. The relationship is exact in metric SI and is fixed by the SI prefix system. For mental math, "Hz × 10⁻⁶" or "shift decimal 6 places" lands the MHz figure cleanly: 1,000,000 Hz is 1 MHz, 100,500,000 Hz is 100.5 MHz, 14,000,000 Hz is 14 MHz. The conversion is one of the larger within-SI scale jumps in everyday work, particularly common in mechanical-engineering Hz-vibration to MHz cross-disciplinary acoustic-engineering reference, atomic-clock Hz-primary-standard to MHz engineering reference, FM-radio Hz-transmitter-primary to MHz consumer-tuning, and HF-amateur-radio Hz-fine-tuning to MHz band-allocation work.
Worked examples
Example 1 — 1000000 Hz
One million hertz equals exactly 1 MHz 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 — 100500000 Hz
One hundred million five hundred thousand hertz — a typical FM-radio mid-band-frequency — converts to 100.5 MHz on the consumer-radio tuning display. That is the figure on the consumer-FM-radio tuning display for a typical regional-FM station, with the Hz-figure on the underlying transmitter-frequency primary and the MHz-figure on the consumer-tuning display.
Example 3 — 14000000 Hz
Fourteen million hertz — the amateur-radio 20m HF-band lower-edge — converts to 14 MHz on the amateur-radio band-allocation documentation. That is the figure on the IARU and ITU amateur-radio band-allocation reference, with the Hz-figure on the underlying transmitter-precision primary and the MHz-figure on the band-allocation reference.
Hz to MHz conversion table
| Hz | MHz |
|---|---|
| 1 Hz | 0 MHz |
| 2 Hz | 0 MHz |
| 3 Hz | 0 MHz |
| 4 Hz | 0 MHz |
| 5 Hz | 0 MHz |
| 6 Hz | 0 MHz |
| 7 Hz | 0 MHz |
| 8 Hz | 0 MHz |
| 9 Hz | 0 MHz |
| 10 Hz | 0 MHz |
| 15 Hz | 0 MHz |
| 20 Hz | 0 MHz |
| 25 Hz | 0 MHz |
| 30 Hz | 0 MHz |
| 40 Hz | 0 MHz |
| 50 Hz | 0 MHz |
| 75 Hz | 0.0001 MHz |
| 100 Hz | 0.0001 MHz |
| 150 Hz | 0.0001 MHz |
| 200 Hz | 0.0002 MHz |
| 250 Hz | 0.0003 MHz |
| 500 Hz | 0.0005 MHz |
| 750 Hz | 0.0008 MHz |
| 1000 Hz | 0.001 MHz |
| 2500 Hz | 0.0025 MHz |
| 5000 Hz | 0.005 MHz |
Common Hz to MHz conversions
- 1000 Hz=0.001 MHz
- 100000 Hz=0.1 MHz
- 1000000 Hz=1 MHz
- 5000000 Hz=5 MHz
- 14000000 Hz=14 MHz
- 27000000 Hz=27 MHz
- 88000000 Hz=88 MHz
- 100000000 Hz=100 MHz
- 1000000000 Hz=1000 MHz
- 9192631770 Hz=9192.6318 MHz
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.
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 Hertz to Megahertz
Mechanical-engineering Hz high-frequency-vibration measurements rolled up to MHz acoustic-engineering reference
Mechanical-engineering high-frequency-vibration analysis (turbomachinery vibration analysis, ultrasound non-destructive testing, structural-acoustic vibration testing) measures Hz-precision raw vibration-frequency data that occasionally rolls up to MHz for cross-disciplinary acoustic-engineering reference work. A 1,000,000 Hz turbomachinery high-frequency-vibration rolls up to 1 MHz on the cross-disciplinary acoustic-engineering reference; a 5,000,000 Hz ultrasound-NDT measurement rolls up to 5 MHz. The conversion runs at every mechanical-engineering Hz-precision to MHz acoustic-engineering reference step.
Atomic-clock primary-standard Hz precision rolled up to MHz cross-disciplinary engineering reference
Atomic-clock primary-standard frequency-precision is denominated in exact-Hz precision under the SI second-definition (Cs-133 hyperfine-transition at exactly 9,192,631,770 Hz), but cross-disciplinary engineering reference rolls up to MHz for legibility. The 9,192,631,770 Hz primary standard rolls up to 9192.631770 MHz; the modern optical-lattice atomic-clock at hundreds of THz rolls up to hundreds of millions of MHz. The conversion runs at every atomic-clock primary-standard to cross-disciplinary engineering reference step.
FM-radio Hz transmitter-frequency primary rolled up to MHz consumer-tuning display
FM-radio transmitter-frequency primary documentation in Hz precision (typical ±1000 Hz precision for ITU-compliant FM stations) rolls up to MHz for consumer-facing tuning-display reference. A 100,500,000 Hz BBC Radio 1 mid-band-frequency rolls up to 100.5 MHz on the consumer-radio tuning display; a 88,000,000 Hz FM-band lower-edge rolls up to 88 MHz. The conversion runs at every FM-station Hz-precision-primary to MHz-consumer-tuning step.
HF-amateur-radio Hz fine-tuning steps rolled up to MHz amateur-radio band documentation
HF amateur-radio fine-tuning operates at Hz-precision steps (typical 100 Hz-1 kHz tuning increments on modern transceivers) but the band-allocation documentation runs in MHz precision. A 14,000,000 Hz amateur-radio 20m HF-band lower-edge rolls up to 14 MHz on the amateur-radio band-allocation documentation; a 14,350,000 Hz upper-edge rolls up to 14.35 MHz. The conversion runs at every amateur-radio Hz-fine-tuning to MHz-band-allocation step.
When to use Megahertz instead of Hertz
Use megahertz whenever 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 document where MHz-scale granularity is more legible than Hz-precision. Megahertz are the standard everyday-engineering frequency unit for FM-and-TV broadcasting, medical ultrasound, and HF-and-VHF amateur-radio band-allocations under ITU radio regulations globally. Stay in hertz when the destination is the underlying mechanical-engineering Hz-precision vibration measurement, the underlying atomic-clock primary-standard precision, the underlying FM-radio transmitter-frequency primary, the underlying HF-amateur-radio fine-tuning step, or any precision-source work where Hz granularity is the natural unit. The conversion is the within-SI scale roll-up between Hz-precision source and MHz-display destination engineering documentation.
Common mistakes converting Hz to MHz
- Confusing hertz-to-megahertz (divide by 1,000,000) with hertz-to-kilohertz (divide by 1000). Both are within-SI scale conversions but at different scale steps, and mixing them up gives a thousandfold error. The standard frequency hierarchy is 1 GHz = 1000 MHz = 1,000,000 kHz = 1,000,000,000 Hz.
- Skipping the decimal-shift count in mental math. A "Hz × 10⁻⁵" gives a tenfold-too-large MHz result; a "Hz × 10⁻⁷" gives a tenfold-too-small MHz result. The correct decimal shift is six places (10⁻⁶), 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 equals exactly 1,000,000 hertz (10⁶ Hz) by SI prefix definition. The millionfold ratio is fixed by the SI prefix system and is exact across every modern frequency-measurement context. The "1 MHz = 1,000,000 Hz" reference is the canonical radio-frequency-engineering conversion factor.
How many MHz in 100,500,000 Hz?
One hundred million five hundred thousand hertz equals 100.5 MHz. That is a typical FM-radio mid-band-frequency translated for consumer-radio tuning-display reference, with the Hz-figure on the underlying transmitter-frequency primary and the MHz-figure on the consumer-tuning display. The conversion runs cleanly via the millionfold SI prefix factor.
How many MHz in 14,000,000 Hz (amateur 20m band)?
Fourteen million hertz equals 14 MHz. That is the amateur-radio 20m HF-band lower-edge translated for the IARU and ITU amateur-radio band-allocation reference, with the Hz-figure on the underlying transmitter-precision primary and the MHz-figure on the band-allocation reference. The conversion is exact via the millionfold SI prefix factor.
Quick way to convert Hz to MHz in my head?
Shift the decimal six places to the left, or divide by 1,000,000. For 1,000,000 Hz that gives 1 MHz, for 100,500,000 Hz that gives 100.5 MHz, for 14,000,000 Hz that gives 14 MHz. The six-place shift is at the edge of comfortable mental-decimal-place tracking — most users prefer to compute via the intermediate kHz step (Hz ÷ 1000 to kHz, then kHz ÷ 1000 to MHz).
How does Hz-to-MHz relate to Hz-to-GHz?
Hertz-to-megahertz divides by 1,000,000 (10⁶); hertz-to-gigahertz divides 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. The Cs-133 hyperfine-transition at 9,192,631,770 Hz rolls up to 9192.631770 MHz or 9.192631770 GHz, depending on the destination unit.
When does Hz-to-MHz conversion appear in real work?
Hz-to-MHz appears in mechanical-engineering Hz high-frequency-vibration measurements rolled up to MHz acoustic-engineering reference, atomic-clock primary-standard Hz precision rolled up to MHz cross-disciplinary engineering reference, FM-radio Hz transmitter-frequency primary rolled up to MHz consumer-tuning display, and HF-amateur-radio Hz fine-tuning steps rolled up to MHz amateur-radio band documentation. The conversion is uncommon in everyday consumer work but routine in radio-engineering and atomic-clock metrology contexts. The millionfold ratio is fixed by the SI prefix system and is exact at every step.
How precise should Hz-to-MHz be for atomic-clock work?
For atomic-clock primary-standard work the Hz-to-MHz conversion is exact (1 MHz = 1,000,000 Hz), and the precision allowance comes from the underlying atomic-clock measurement precision (typically 1 part in 10^15 for caesium-fountain primary clocks, approaching 1 part in 10^18 for optical-lattice atomic clocks). The MHz-figure on cross-disciplinary engineering reference rolls up cleanly without introducing additional rounding error. The factor is universal across modern frequency measurement.