Megahertz to Kilohertz (MHz to kHz)
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Megahertz-to-kilohertz conversions translate MHz-display FM-radio, TV-broadcasting, and amateur-radio frequencies into kHz precision needed for fine channel-tuning, transmitter-frequency primary documentation, and cross-band reference to AM-radio and audio-engineering frequency landscapes. A 100 MHz FM-radio mid-band frequency rolls down to 100,000 kHz on the cross-band reference; a 27 MHz CB-radio Channel 1 rolls down to 27,000 kHz on the engineering-spec channel-spacing primary; a 14 MHz HF amateur-radio 20m-band rolls down to 14,000 kHz on the amateur-radio fine-tuning documentation. The math is a clean three-decimal-place shift the other way (1 MHz = 1000 kHz).
How to convert Megahertz to Kilohertz
Formula
kHz = MHz × 1000
To convert megahertz to kilohertz, multiply the MHz 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 mega- prefix at exactly 1000 times the kilo- prefix. For mental math, "MHz × 1000" lands the kHz figure cleanly: 1 MHz is 1000 kHz, 27 MHz is 27,000 kHz, 100 MHz is 100,000 kHz. The conversion runs at every MHz-display-source to kHz-precision-destination boundary across FM-radio MHz-station to kHz-cross-band-reference, CB-radio MHz-consumer-display to kHz-engineering-spec, amateur-radio MHz-HF-band to kHz-fine-tuning, and medical-ultrasound MHz to kHz-acoustic-engineering cross-disciplinary work.
Worked examples
Example 1 — 1 MHz
One megahertz equals exactly 1000 kilohertz by SI prefix definition. That is the canonical MHz-to-kHz reference roll-down.
Example 2 — 100 MHz
One hundred megahertz — a typical FM-radio mid-band station-frequency — converts to 100,000 kHz on the cross-band reference. That is the figure on the cross-band radio-engineering documentation comparing FM-radio to AM-radio and audio-engineering frequency landscapes.
Example 3 — 27 MHz
Twenty-seven megahertz — the CB-radio band centre-frequency — converts to 27,000 kHz on the engineering-spec channel-spacing primary. That is the figure on the FCC and OFCOM CB-radio band-allocation engineering documentation, with the MHz-figure on the consumer-radio packaging and the kHz-figure on the engineering-spec primary.
MHz to kHz conversion table
| MHz | kHz |
|---|---|
| 1 MHz | 1000 kHz |
| 2 MHz | 2000 kHz |
| 3 MHz | 3000 kHz |
| 4 MHz | 4000 kHz |
| 5 MHz | 5000 kHz |
| 6 MHz | 6000 kHz |
| 7 MHz | 7000 kHz |
| 8 MHz | 8000 kHz |
| 9 MHz | 9000 kHz |
| 10 MHz | 10000 kHz |
| 15 MHz | 15000 kHz |
| 20 MHz | 20000 kHz |
| 25 MHz | 25000 kHz |
| 30 MHz | 30000 kHz |
| 40 MHz | 40000 kHz |
| 50 MHz | 50000 kHz |
| 75 MHz | 75000 kHz |
| 100 MHz | 100000 kHz |
| 150 MHz | 150000 kHz |
| 200 MHz | 200000 kHz |
| 250 MHz | 250000 kHz |
| 500 MHz | 500000 kHz |
| 750 MHz | 750000 kHz |
| 1000 MHz | 1000000 kHz |
| 2500 MHz | 2500000 kHz |
| 5000 MHz | 5000000 kHz |
Common MHz to kHz conversions
- 0.5 MHz=500 kHz
- 1 MHz=1000 kHz
- 5 MHz=5000 kHz
- 14 MHz=14000 kHz
- 27 MHz=27000 kHz
- 50 MHz=50000 kHz
- 100 MHz=100000 kHz
- 500 MHz=500000 kHz
- 1000 MHz=1000000 kHz
- 6000 MHz=6000000 kHz
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 Kilohertz?
The kilohertz (kHz) is exactly 1000 hertz by SI prefix definition. The relationship is fixed and exact, with the kilo- prefix denoting 1000 of the underlying unit. One kHz equals 1000 cycles per second. The recognised SI symbol is "kHz", with lowercase "k" SI prefix and uppercase "Hz" honouring Heinrich Hertz. The kilohertz is the standard everyday-engineering frequency unit for the typical kHz-scale frequency figures: AM radio (535-1605 kHz medium-wave band), audio sampling rates (44.1-192 kHz), audio-equipment frequency response (up to 20 kHz human-hearing upper limit), low-frequency ultrasound (20-200 kHz). Higher-frequency multiples use megahertz (MHz, 1000 kHz) for FM radio and television broadcast bands, and gigahertz (GHz, 1,000,000 kHz) for mobile-cellular and satellite-communication bands.
The kilohertz emerged with the hertz itself, fixed by the SI prefix system that has been in continuous use since the 1875 Metre Convention and incorporated into the SI at the 11th CGPM in 1960. The hertz was named at the 14th CGPM in 1971 to honour Heinrich Hertz's 1886-1889 experiments demonstrating electromagnetic waves, and the kilohertz as the everyday-engineering multiple followed naturally for radio-frequency and audio-engineering work. The kilohertz dominates AM radio broadcasting globally — every AM radio station worldwide operates in the 535-1605 kHz medium-wave band under ITU radio regulations. The kHz is also dominant in audio engineering for sampling rates (44.1 kHz CD audio, 48 kHz video audio), audio-equipment frequency-response specifications (extending up to 20 kHz human-hearing limit), and ultrasound (above 20 kHz, up to MHz range for medical imaging). The 2019 SI redefinition preserved the kilohertz via the second-anchored SI definition, with the underlying Cs-133 hyperfine-transition atomic-clock primary standard providing the foundational frequency reference for all SI units globally. Modern kHz-frequency engineering spans AM radio, audio sampling, audio-equipment frequency response, low-frequency ultrasound, and marine sonar across every commercial-and-engineering context.
AM radio broadcasting universally: every AM radio station worldwide operates in the 535-1605 kHz medium-wave band under ITU radio regulations. Typical AM stations occupy 10 kHz channels (US, Canada, Mexico) or 9 kHz channels (rest of world). Long-wave AM at 153-279 kHz appears in EU, Asia, Africa. Audio sampling rates and digital audio: standard CD audio at 44.1 kHz sampling rate, video-audio at 48 kHz, hi-res audio at 96 kHz or 192 kHz. Every digital-audio file-format (MP3, AAC, FLAC, WAV) specifies sampling rate in kHz. Audio-and-music production equipment (Pro Tools, Logic Pro, Ableton Live) uses kHz figures throughout. Audio-equipment frequency response: hi-fi-audio amplifiers and speakers specify frequency-response in Hz/kHz, typically 20 Hz-20 kHz for full-range systems with ±1 dB flatness. Speaker-and-headphone driver crossover frequencies are specified in kHz (typical tweeter-to-woofer crossover 1.5-3 kHz). Low-frequency ultrasound: ultrasound applications below 1 MHz (20-200 kHz typical) appear in industrial-cleaning ultrasonic baths, medical-physiotherapy ultrasound, and acoustic-engineering low-frequency vibration analysis. Marine sonar: military and commercial sonar systems operate in the 1-100 kHz range for underwater detection, with low-frequency sonar at 1-10 kHz for long-range detection and high-frequency sonar at 50-100 kHz for high-resolution imaging.
Real-world uses for Megahertz to Kilohertz
FM-radio MHz station frequencies translated to kHz cross-band reference
FM-radio station frequencies in the 88-108 MHz VHF Band II translate to kHz for cross-band reference to AM-radio medium-wave and audio-engineering frequency-response landscapes. A 100 MHz FM-radio mid-band station rolls down to 100,000 kHz; a 88 MHz FM-radio lower-edge station rolls down to 88,000 kHz; a 108 MHz FM-radio upper-edge rolls down to 108,000 kHz. The conversion runs at every FM-radio engineering documentation cross-band reference step.
CB-radio MHz consumer-display channels translated to kHz engineering-spec channel-spacing
CB-radio MHz consumer-display channel frequencies (Channel 1 at 26.965 MHz, Channel 40 at 27.405 MHz across 40 channels) translate to kHz engineering-spec channel-spacing primary for the FCC and OFCOM CB-radio band-allocation engineering documentation. A 27 MHz CB-radio Channel 1 lower frequency rolls down to 27,000 kHz; a 27.405 MHz Channel 40 upper rolls down to 27,405 kHz. The conversion runs at every CB-radio consumer-display to engineering-spec documentation step, with the 10-kHz channel-spacing visible on the kHz-precision figure.
Amateur-radio MHz HF-band allocations translated to kHz fine-tuning increments
Amateur-radio HF-band MHz allocations (160m at 1.8-2.0 MHz, 80m at 3.5-4.0 MHz, 40m at 7.0-7.3 MHz, 20m at 14.0-14.35 MHz, 17m at 18.068-18.168 MHz, 15m at 21.0-21.45 MHz, 10m at 28.0-29.7 MHz) translate to kHz precision for fine-tuning increments on amateur-radio transceivers. A 14 MHz 20m-band lower-edge rolls down to 14,000 kHz; a 14.35 MHz upper-edge rolls down to 14,350 kHz, with kHz-precision tuning typical for amateur-radio operation. The conversion runs at every amateur-radio band-allocation to fine-tuning step.
Medical-ultrasound MHz clinical frequencies cross-referenced to kHz audio-and-vibration engineering
Medical-ultrasound MHz clinical-imaging frequencies (1-15 MHz typical clinical ultrasound across abdominal, cardiac, obstetric, and vascular examinations) cross-reference to kHz for cross-disciplinary acoustic-engineering education and ultrasound-vs-audible-frequency comparison in clinical-physics curricula. A 5 MHz cardiac-ultrasound frequency rolls down to 5000 kHz on the cross-disciplinary reference; a 1 MHz deep-tissue-imaging frequency rolls down to 1000 kHz. The conversion runs at every medical-ultrasound to acoustic-engineering cross-disciplinary documentation step.
When to use Kilohertz instead of Megahertz
Use kilohertz whenever the destination is fine channel-tuning increments, transmitter-frequency primary documentation, cross-band reference to AM-radio and audio-engineering frequency landscapes, engineering-spec channel-spacing primary, or any context where kHz-precision is the natural unit. Kilohertz is the standard precision unit for fine-tuning and channel-spacing in radio-engineering across HF and VHF bands globally, with typical kHz-precision tuning steps on modern Yaesu, Icom, and Kenwood transceivers. Stay in megahertz when the destination is consumer-radio packaging, FM-radio band-allocation document, TV-broadcasting band-allocation, amateur-radio HF-band allocation document, or any context where MHz-scale granularity is more legible than kHz-precision. The conversion is the within-SI scale roll-down between MHz-display source and kHz-precision destination engineering documentation.
Common mistakes converting MHz to kHz
- Skipping the multiply-by-1000 step and treating MHz and kHz as numerically equivalent. The two units differ by a factor of 1000. A "100 MHz" FM-radio station treated as "100 kHz" would be far below the AM-radio band edge (long-wave region 153-279 kHz), in error by three orders of magnitude.
- Confusing MHz-to-kHz (multiply by 1000) with MHz-to-Hz (multiply by 1,000,000). Both are within-SI scale conversions but at different scale steps. The MHz-to-kHz step is multiply-by-1000; the MHz-to-Hz step is multiply-by-1,000,000. Mixing them up gives a thousandfold error.
Frequently asked questions
How many kHz in 1 MHz?
One megahertz equals exactly 1000 kilohertz by SI prefix definition. The thousandfold ratio is fixed and unchanging across every modern frequency-measurement context. The "1 MHz = 1000 kHz" reference is the canonical radio-frequency-engineering cross-band conversion factor.
How many kHz in 100 MHz (FM radio)?
One hundred megahertz equals 100 × 1000 = 100,000 kHz. That is a typical FM-radio mid-band station-frequency translated for cross-band radio-engineering documentation, with the MHz-figure on the FM-radio consumer-tuning display and the kHz-figure on the cross-band reference comparing FM-radio to AM-radio and audio-engineering frequency landscapes. The conversion is exact via the thousandfold SI prefix factor.
How many kHz in 27 MHz (CB radio)?
Twenty-seven megahertz equals 27 × 1000 = 27,000 kHz. That is the CB-radio band centre-frequency translated for the engineering-spec channel-spacing primary documentation, with 10-kHz channel-spacing visible on the kHz-precision figure across the 40 CB channels (Channel 1 at 26,965 kHz to Channel 40 at 27,405 kHz). The MHz-figure is on the consumer-radio packaging.
Quick way to convert MHz to kHz in my head?
Multiply the MHz figure by 1000 — a three-decimal-place shift to the right. For 1 MHz that gives 1000 kHz, for 27 MHz that gives 27,000 kHz, for 100 MHz that gives 100,000 kHz. The conversion is one of the cleanest mental-math operations in metric frequency measurement.
How many kHz in 14 MHz (amateur-radio 20m band)?
Fourteen megahertz equals 14,000 kHz. That is the lower edge of the amateur-radio 20m HF-band (14.0-14.35 MHz). Amateur-radio operators use kHz-precision tuning increments for fine-station-tuning across the 350-kHz wide 20m band, with typical 100 Hz to 1 kHz tuning steps on modern amateur-radio transceivers.
When does MHz-to-kHz appear in real work?
Mhz-to-kHz appears in FM-radio MHz station frequencies translated to kHz cross-band reference, CB-radio MHz consumer-display channels translated to kHz engineering-spec channel-spacing, amateur-radio MHz HF-band allocations translated to kHz fine-tuning increments, and medical-ultrasound MHz clinical frequencies cross-referenced to kHz audio-and-vibration engineering. The conversion is one of the most-run within-SI frequency conversions in cross-band radio and acoustic engineering. Each case rolls down MHz-display sources to kHz-precision destination work.
How precise should MHz-to-kHz be for radio-engineering?
For radio-engineering the MHz-to-kHz conversion is exact (1 MHz = 1000 kHz), and the precision allowance comes from the underlying source-measurement precision. The kHz-figure on engineering-spec channel-spacing rolls up cleanly without introducing additional rounding error at the conversion step. The factor is universal across modern frequency measurement.