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Essential for audio engineering, electronics, and physics. Results update in real-time and can be shared via URL.\n\nValue\n\nFrom cycle/second degree/hour degree/minute degree/second gigahertz hertz kilohertz megahertz millihertz radian/hour radian/minute radian/second revolution/hour revolution/minute revolution/second rpm terrahertz\n\nTo cycle/second degree/hour degree/minute degree/second gigahertz hertz kilohertz megahertz millihertz radian/hour radian/minute radian/second revolution/hour revolution/minute revolution/second rpm terrahertz\n\nResult\n\nYour recent:\n\nCopied!\n\n## Frequency Conversion Formulas\n\n**kHz → Hz:** `× 1,000`\n\n**MHz → kHz:** `× 1,000`\n\n**GHz → MHz:** `× 1,000`\n\n**RPM → Hz:** `÷ 60`\n\n**rad/s → Hz:** `÷ (2π)`\n\n**deg/s → Hz:** `÷ 360`\n\n## Electromagnetic Spectrum \u0026 Everyday Frequencies\n\nFrequencyValueDescription Earth's rotation11.6 μHzOne revolution per day Human heartbeat1 – 1.7 Hz60–100 beats per minute Mains electricity (US)60 HzAC power grid frequency Bass guitar low E41.2 HzLowest standard tuning note Concert pitch A440 HzStandard tuning reference AM radio530 – 1,700 kHzMedium wave broadcast FM radio88 – 108 MHzVHF broadcast band Wi-Fi 2.4 GHz2.4 GHz802.11 wireless LAN Wi-Fi 5 GHz5 GHz802.11ac/ax wireless LAN 5G mmWave24 – 47 GHzHigh-band 5G cellular Visible light430 – 770 THzRed (430 THz) to violet (770 THz) Gamma rays\u0026gt; 30 EHzHighest energy EM radiation\n\n## Audio Frequency Ranges\n\nRangeFrequencyDescription Sub-bass20 – 60 HzFelt more than heard; subwoofers Bass60 – 250 HzBass instruments, male vocal Low midrange250 – 500 HzWarmth, body of instruments Midrange500 Hz – 2 kHzVocal fundamentals Upper midrange2 – 4 kHzSpeech clarity, presence Brilliance6 – 20 kHzSparkle, air, cymbal shimmer\n\n## Frequently Asked Questions\n\n### How many hertz are in a kilohertz?\n\n**1,000 Hz** = 1 kHz. The prefix chain is: 1 THz = 1,000 GHz = 1,000,000 MHz = 10⁹ kHz = 10¹² Hz.\n\n### What is the difference between Hz and RPM?\n\nHz = cycles per **second**; RPM = revolutions per **minute**. Convert: Hz = RPM ÷ 60. A 7,200 RPM hard drive spins at 120 Hz.\n\n### What frequency can humans hear?\n\n**20 Hz to 20 kHz**, with peak sensitivity at 2–5 kHz (speech range). Hearing range narrows with age — most adults lose frequencies above 15–17 kHz.\n\n### What is a gigahertz?\n\n1 GHz = **1 billion Hz** (10⁹). Modern CPUs run at 3–5 GHz. Wi-Fi uses 2.4 GHz and 5 GHz bands. 5G sub-6 uses up to 6 GHz, mmWave up to 47 GHz.\n\n### How do you convert radians per second to hertz?\n\nDivide by **2π**: Hz = rad/s ÷ 6.2832. One full rotation = 2π radians, so 2π rad/s = 1 Hz. This is called the *angular frequency* formula: ω = 2πf.\n\n### What is the best free frequency converter?\n\nThis free frequency converter supports hertz, kilohertz, megahertz, gigahertz, terahertz, RPM, and radians per second. Results are instant with no registration or software to install.\n\n### Can I share my frequency conversion result?\n\nYes. After converting, you can copy the result with one click or share a permanent link that includes your converted value — ideal for documentation, reports, or sending to colleagues.\n\n### Key Facts\n\n- 📻 \"Hertz\" named after Heinrich Hertz, who proved EM waves (1887)\n- 📻 1 Hz = 1 cycle per second (symbol: Hz)\n- 📻 Human hearing: 20 Hz – 20 kHz\n- 📻 Visible light: 430–770 THz\n- 📻 Mains power: 50 Hz (most of world) or 60 Hz (Americas, parts of Asia)\n- 📻 Cesium-133 atomic clock: 9,192,631,770 Hz defines the second\n\n## Related Products\n\n[📡 Frequency Counters →](https://www.amazon.com/s?k=frequency%20counter%20digital\u0026tag=tejji-20) [🎸 Guitar Tuners →](https://www.amazon.com/s?k=guitar%20tuner%20clip%20on\u0026tag=tejji-20) [🔬 Signal Generators →](https://www.amazon.com/s?k=signal%20generator%20function\u0026tag=tejji-20)\n\n*As an Amazon Associate, tejji.com earns from qualifying purchases.*\n\n### Frequency History\n\n- **1887:** Hertz proves EM waves\n- **1930:** Unit \"hertz\" adopted (replacing \"cycles per second\")\n- **1967:** Second defined via cesium-133 frequency\n- **1971:** First microprocessor at 740 kHz (Intel 4004)\n- **2024:** Consumer CPUs reach 6+ GHz boost\n\n### Related Conversions\n\n[🏎️ Speed Conversion](/convert/speed-conversion) [📐 Angle Conversion](/convert/angle-conversion) [📊 Metric Prefix Conversion](/convert/metric-conversion) [🔄 All Converters](/convert)\n\n[All unit converters →](/convert)\n\n📱\n\nQuick Access\n\nInstall this tool on your device for instant access\n\nInstall App\n\n- Temperature\n- [Temperature](/convert/temperature-conversion)\n\n\u003c!--THE END--\u003e\n\n- Length\n- [Length](/convert/length-conversion)\n\n\u003c!--THE END--\u003e\n\n- Length (Metric)\n- [Length (Metric)](/convert/length-metric-conversion)\n\n\u003c!--THE END--\u003e\n\n- Metric\n- [Metric](/convert/metric-conversion)\n\n\u003c!--THE END--\u003e\n\n- Bytes\n- [Bytes](/convert/bytes-conversion)\n\n\u003c!--THE END--\u003e\n\n- Bytes Widgets\n- [Bytes Widgets](/convert/bytes-conversion/widgets)\n\n\u003c!--THE END--\u003e\n\n- Number\n- [Number](/convert/number-conversion)\n\n\u003c!--THE END--\u003e\n\n- Angle\n- [Angle](/convert/angle-conversion)\n\n\u003c!--THE END--\u003e\n\n- Astronomical\n- [Astronomical](/convert/astronomical-conversion)\n\n\u003c!--THE END--\u003e\n\n- Frequency\n- [Frequency](/convert/frequency-conversion)\n\n\u003c!--THE END--\u003e\n\n- Mileage\n- [Mileage](/convert/mileage-conversion)\n\n\u003c!--THE END--\u003e\n\n- Mass / Weight\n- [Mass / Weight](/convert/mass-conversion)\n\n\u003c!--THE END--\u003e\n\n- Mass (Metric)\n- [Mass (Metric)](/convert/mass-metric-conversion)\n\n\u003c!--THE END--\u003e\n\n- Speed\n- [Speed](/convert/speed-conversion)","footer":"\n\n📱 Install Tejji for quick access to this tool Install\n\nTools\n\n- [All Apps](/apps/)\n- [Converters](/convert/)\n- [IP Tools](/ip/)\n- [Calculator](/apps/calculator)\n\nExplore\n\n- [Time \u0026 Date](/time-date/)\n- [Postal Codes](/zip-codes/)\n- [Typing](/typing/)\n- [Extensions](/browser/chrome/extensions/)\n\nCompany\n\n- [About](/home/about)\n- [Contact](/home/contact)\n- [Privacy](/home/privacy)\n- [Terms](/home/terms)\n\nSupport\n\n- [Feedback](/home/contact)\n- [Buy me a coffee](https://buymeacoffee.com/tejji)\n\n© 2026 [Tejji.com](/) — Free online tools for everyone.\n\nWe use cookies for analytics and ads. By clicking \"Accept\", you consent to our use of cookies. [Privacy Policy](/home/privacy)\n\nReject Accept"},"metadata":{"title":"1 kilohertz in cycle/second | Frequency Conversion | Tejji","description":"Free online frequency converter — convert between hertz, kilohertz, megahertz, gigahertz, terahertz, RPM, and radians/second instantly, no sign-up required. Includes electromagnetic spectrum chart and audio frequency guide. Works on all devices.","imageUrl":"https://tejji.com/page/og-default.png","author":null,"published":null,"modified":null},"rate":{"price":{"priceMicros":0,"currency":""},"license":{"cuid":"","licenseType":"","licensePath":"","permissions":[],"validUntil":""},"error":""}}]