Kilohertz to Megahertz (kHz to MHz)
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Kilohertz-to-megahertz conversions translate kHz-display low-frequency-radio and audio-engineering figures into MHz used for FM radio, TV broadcasting, and medical-ultrasound documentation. A 1620 kHz upper-AM-band frequency converts to 1.62 MHz on the cross-band reference; a 27,000 kHz CB radio frequency converts to 27 MHz on the standard CB-radio band; a 9000 kHz HF amateur-radio frequency converts to 9 MHz on the amateur-radio band reference. The factor is a clean three-decimal-place shift in metric SI (1 MHz = 1000 kHz), matching the standard SI prefix relationship.
How to convert Kilohertz to Megahertz
Formula
MHz = kHz × 0.001
To convert kilohertz to megahertz, multiply the kHz 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. For mental math, "kHz ÷ 1000" lands the MHz figure cleanly: 1000 kHz is 1 MHz, 27,000 kHz is 27 MHz, 1620 kHz is 1.62 MHz. The conversion runs at every kHz-precision-source to MHz-display-destination boundary across AM-radio kHz-band-edges to HF-amateur MHz-bands, CB-radio kHz-channel to MHz-display, HF-amateur kHz-tuning to MHz-band-allocation, and audio-to-ultrasound cross-disciplinary engineering work. The factor is exact rather than approximate.
Worked examples
Example 1 — 1000 kHz
One thousand kilohertz equals exactly 1 MHz 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 — 1620 kHz
One thousand six hundred and twenty kilohertz — slightly above the AM-radio medium-wave upper limit at 1605 kHz — converts to 1.62 MHz on the cross-band radio-engineering reference. That is the boundary between AM-radio medium-wave and HF amateur-radio 160m band, with the kHz-figure on the AM-band-edge reference and the MHz-figure on the HF-amateur-band reference.
Example 3 — 27000 kHz
Twenty-seven thousand kilohertz — the CB-radio Channel 1 lower frequency — converts to 27 MHz on the consumer-radio packaging. That is the figure on every CB-radio consumer product, with the kHz-figure on the engineering-spec channel-spacing primary and the MHz-figure on the consumer-display reference.
kHz to MHz conversion table
| kHz | MHz |
|---|---|
| 1 kHz | 0.001 MHz |
| 2 kHz | 0.002 MHz |
| 3 kHz | 0.003 MHz |
| 4 kHz | 0.004 MHz |
| 5 kHz | 0.005 MHz |
| 6 kHz | 0.006 MHz |
| 7 kHz | 0.007 MHz |
| 8 kHz | 0.008 MHz |
| 9 kHz | 0.009 MHz |
| 10 kHz | 0.01 MHz |
| 15 kHz | 0.015 MHz |
| 20 kHz | 0.02 MHz |
| 25 kHz | 0.025 MHz |
| 30 kHz | 0.03 MHz |
| 40 kHz | 0.04 MHz |
| 50 kHz | 0.05 MHz |
| 75 kHz | 0.075 MHz |
| 100 kHz | 0.1 MHz |
| 150 kHz | 0.15 MHz |
| 200 kHz | 0.2 MHz |
| 250 kHz | 0.25 MHz |
| 500 kHz | 0.5 MHz |
| 750 kHz | 0.75 MHz |
| 1000 kHz | 1 MHz |
| 2500 kHz | 2.5 MHz |
| 5000 kHz | 5 MHz |
Common kHz to MHz conversions
- 100 kHz=0.1 MHz
- 500 kHz=0.5 MHz
- 1000 kHz=1 MHz
- 1620 kHz=1.62 MHz
- 5000 kHz=5 MHz
- 10000 kHz=10 MHz
- 14000 kHz=14 MHz
- 27000 kHz=27 MHz
- 100000 kHz=100 MHz
- 1000000 kHz=1000 MHz
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.
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 Kilohertz to Megahertz
AM-radio kHz upper-band frequencies cross-referenced to MHz HF-amateur-radio bands
AM-radio kHz upper-band frequencies (1605 kHz upper limit of medium-wave) cross-reference to MHz HF-amateur-radio bands (1.8 MHz upper-160m amateur-band, 3.5 MHz lower-80m amateur-band) for radio-engineering and amateur-radio band-planning documentation. A 1620 kHz frequency rolls up to 1.62 MHz on the HF-amateur-band cross-reference; a 1605 kHz upper-AM-band rolls up to 1.605 MHz. The conversion runs at every cross-band radio-engineering documentation step.
CB radio kHz channel frequencies cross-referenced to MHz HF-amateur-radio bands
CB radio (Citizens Band) channel frequencies in the 27 MHz HF band (specifically 26.965-27.405 MHz across 40 channels in the US Class D CB allocation) translate from kHz-precision channel-spacing (10 kHz channel spacing) to MHz-display for the consumer-facing radio-channel documentation. A 27,000 kHz CB-radio Channel 1 lower frequency rolls up to 27 MHz on the consumer-radio packaging; a 27,405 kHz CB-radio Channel 40 upper frequency rolls up to 27.405 MHz. The conversion runs at every CB-radio engineering-spec to consumer-display step.
HF-amateur-radio kHz channel frequencies cross-referenced to MHz amateur-radio bands
HF (high-frequency) amateur-radio operations span the 160m-band (1.8-2.0 MHz), 80m-band (3.5-4.0 MHz), 40m-band (7.0-7.3 MHz), 20m-band (14.0-14.35 MHz), 17m-band (18.068-18.168 MHz), 15m-band (21.0-21.45 MHz), 12m-band (24.89-24.99 MHz), and 10m-band (28.0-29.7 MHz). Amateur-radio kHz-precision tuning (typical 100 Hz-1 kHz tuning steps on modern Yaesu, Icom, Kenwood transceivers) translates to MHz-display for the amateur-radio band-allocation documentation under IARU and ITU regulations. The conversion runs at every amateur-radio fine-tuning to band-allocation reference step.
Audio kHz upper-frequency cross-referenced to MHz medical-ultrasound lower-frequency
Audio kHz upper-frequency-response (20 kHz human-hearing upper limit) cross-references to MHz medical-ultrasound lower-frequency (1 MHz lower-end of clinical-ultrasound used for deep abdominal imaging) for cross-disciplinary acoustic-and-ultrasound engineering education and clinical-medicine training. A 20 kHz upper-audio-frequency rolls up to 0.02 MHz on the cross-disciplinary reference; a 200 kHz low-frequency-ultrasound rolls up to 0.2 MHz. The conversion runs at every audio-to-ultrasound cross-disciplinary engineering-education step in clinical-physics curricula and acoustic-engineering CPD materials.
When to use Megahertz instead of Kilohertz
Use megahertz whenever the destination is FM radio band-allocation documentation, TV broadcasting band-allocation, legacy CPU clock-rate spec, medical-ultrasound clinical-imaging frequency, amateur-radio HF-or-VHF band-allocation documentation, or any document where MHz-scale granularity is more legible than kHz-precision. Megahertz are the standard everyday-engineering frequency unit for FM-and-TV broadcasting, medical-ultrasound, and amateur-radio HF-and-VHF band allocations under ITU radio regulations globally. Stay in kilohertz when the destination is AM-radio band allocation, audio-equipment frequency-response, audio-sampling-rate, or any context where kHz-scale granularity is the natural unit. The conversion is the within-SI scale roll-up between kHz-source and MHz-display destination work, particularly common in cross-band radio-engineering and acoustic-vs-ultrasound cross-disciplinary engineering education.
Common mistakes converting kHz to MHz
- Skipping the divide-by-1000 step and treating kHz and MHz as numerically equivalent. The two units differ by a factor of 1000. A "27,000 kHz" CB-radio frequency treated as "27,000 MHz" would be 27 GHz — far above CB-radio band into satellite-communication frequencies. The thousandfold scale-shift is essential.
- Confusing kHz-to-MHz (divide by 1000) with kHz-to-Hz (multiply by 1000). Both are within-SI scale conversions but in opposite directions. The kHz-to-MHz step is divide-by-1000; the kHz-to-Hz step is multiply-by-1000. Mixing them up gives a million-fold error.
Frequently asked questions
How many MHz in 1000 kHz?
One thousand kilohertz equals exactly 1 megahertz by SI prefix definition. The thousandfold ratio is fixed and unchanging across every modern frequency-measurement context. The "1000 kHz = 1 MHz" reference is one of the most commonly-applied SI prefix conversions in radio-frequency engineering.
How many MHz in 27,000 kHz (CB radio)?
Twenty-seven thousand kilohertz equals 27 MHz. That is the standard CB-radio Channel 1 lower frequency in the US Class D CB allocation (26.965-27.405 MHz across 40 channels). The kHz-figure is the engineering-spec channel-spacing primary; the MHz-figure is the consumer-display reference on every CB-radio consumer product packaging.
How many MHz in 1620 kHz?
One thousand six hundred and twenty kilohertz equals 1.62 MHz. That is slightly above the AM-radio medium-wave upper limit (1605 kHz), at the boundary between AM-radio medium-wave and the HF amateur-radio 160m band (1.8-2.0 MHz). The conversion runs at every cross-band radio-engineering documentation step.
Quick way to convert kHz to MHz in my head?
Divide the kHz figure by 1000 — a three-decimal-place shift to the left. For 1000 kHz that gives 1 MHz, for 27,000 kHz that gives 27 MHz, for 1620 kHz that gives 1.62 MHz. The conversion is one of the cleanest mental-math operations in metric frequency measurement.
How does kHz relate to GHz?
One GHz equals 1,000,000 kHz (10⁶ kHz, or 10⁹ Hz). The conversion from kHz to GHz is a six-decimal-place shift, the largest within-SI frequency conversion in everyday work. Cross-band radio-engineering documentation occasionally bridges kHz (audio-and-AM) and GHz (microwave-and-WiFi-and-cellular) contexts via the millionfold kHz-to-GHz factor.
When does kHz-to-MHz appear in real work?
Khz-to-MHz appears in AM-radio kHz upper-band frequencies cross-referenced to MHz HF-amateur-radio bands, CB radio kHz channel frequencies cross-referenced to MHz HF-amateur-radio bands, HF-amateur-radio kHz channel frequencies cross-referenced to MHz amateur-radio bands, and audio kHz upper-frequency cross-referenced to MHz medical-ultrasound lower-frequency. The conversion is one of the most-run within-SI frequency conversions in cross-band radio-engineering work. Each case bridges the AM-radio-and-audio kHz-scale with the FM-and-TV-and-medical-ultrasound MHz-scale.
How precise should kHz-to-MHz be for radio-engineering?
For radio-engineering the kHz-to-MHz conversion is exact (1 MHz = 1000 kHz), and the precision allowance comes from the underlying source-measurement precision. The MHz-figure on consumer-radio packaging rolls up cleanly without introducing additional rounding error at the conversion step, with the source-precision (typically ±100 Hz for ITU-compliant radio-station frequency-allocations) preserved through the conversion. The factor is universal across modern frequency measurement.