Frequency Converter Online — Free Frequency Converter Tool
CodexFuse Team · 2026-10-29T23:26:01.993Z · 8 min read min read
Convert Hz, kHz, MHz, GHz, THz, RPM and rad/s instantly — with a worked example, conversion tables and honest limits.
A frequency converter is an online tool that changes a frequency value from one unit to another — hertz to kilohertz, megahertz to gigahertz, RPM to hertz, or radians per second to hertz — without manual arithmetic. You type one number, pick the two units, and the result appears instantly.
What does a frequency converter actually convert?
A frequency converter converts the rate at which something repeats, expressed in cycles per second and its multiples, plus the rotational and angular units that describe the same idea. Hertz (Hz) is the base unit: one hertz means one cycle per second. Kilohertz, megahertz, gigahertz and terahertz are simply scaled versions of hertz, while RPM, revolutions per second, radians per second and degrees per second describe rotation and angular motion that can be expressed as a frequency.
The free frequency converter on CodexFuse covers nine units in one place: Hz, kHz, MHz, GHz, THz, RPM, RPS, rad/s and degrees per second. Converting through hertz internally means any pair works the same way, and the All conversions panel shows every other unit at once, so you can check your answer from several angles instead of trusting a single output.
How do you convert Hz, kHz, MHz and GHz by hand?
To convert between hertz units by hand, convert through hertz using powers of ten: 1 kHz equals 1,000 Hz, 1 MHz equals 1,000,000 Hz, 1 GHz equals 1,000,000,000 Hz, and 1 THz equals 1,000,000,000,000 Hz. Divide when moving to a larger unit and multiply when moving to a smaller one.
So 2.4 GHz becomes 2,400 MHz, and 44.1 kHz becomes 44,100 Hz. The pattern is easy to remember because each step up divides by 1,000. The mistakes usually come from skipping a step — turning megahertz straight into gigahertz without the factor of 1,000, or confusing a capital M (mega) with a lowercase m (milli), which changes the answer by a factor of a billion.
| Unit | Equals in hertz | Everyday example |
|---|---|---|
| 1 Hz | 1 Hz | One cycle per second |
| 1 kHz | 1,000 Hz | Audio tones, 44.1 kHz sample rates |
| 1 MHz | 1,000,000 Hz | FM radio around 100 MHz |
| 1 GHz | 1,000,000,000 Hz | Wi-Fi at 2.4 GHz and 5 GHz |
| 1 THz | 1,000,000,000,000 Hz | Infrared and optical frequencies |
How do you convert RPM and rad/s to Hz?
To convert RPM to hertz, divide by 60, because there are 60 seconds in a minute: Hz equals RPM divided by 60. To convert radians per second to hertz, divide by 2π (about 6.283): Hz equals rad/s divided by 2π. One hertz also equals 60 RPM, 1 revolution per second, 6.283 rad/s and 360 degrees per second.
Sanity-check every rotational conversion with a known pair: 60 RPM must give 1 Hz, and 3,600 RPM must give 60 Hz. If your answer fails that check, you divided when you should have multiplied, or the other way round.
A worked example: checking a Wi-Fi channel, a motor and an audio file
Meet Sara, a fictional freelance electronics technician in Lahore who is setting up a small workshop. She has three numbers from three different manuals, and she needs them in matching units before she orders anything.
Step 1 — the Wi-Fi router. The router box says 2.4 GHz, but her site-survey app lists channels in MHz. She opens the frequency converter, enters 2.4, selects GHz to MHz, and gets 2,400 MHz instantly. The All conversions panel also shows 2,400,000,000 Hz, which confirms the same value in the base unit.
Step 2 — the workshop motor. A second-hand motor is rated at 1,800 RPM, while the variable-speed drive manual talks about a 30 Hz output. Sara enters 1,800, selects RPM to Hz, and gets 30 Hz. The numbers match, so the drive can run the motor at its rated speed without a gearing surprise.
Step 3 — the audio interface. A client asks for 44.1 kHz audio. Sara converts 44.1 kHz to hertz and gets 44,100 Hz, then copies the result with one click into her quote. Total time for all three checks: under two minutes, with no calculator steps to mistype.
Always double-check the unit symbols on the original datasheet. MHz means megahertz (millions of hertz), while mHz would mean millihertz (thousandths of a hertz). A single letter changes the value by nine orders of magnitude.
When does this kind of conversion go wrong in real work?
- Radio and Wi-Fi planning: channel widths and centre frequencies quoted in different units, so a 20 MHz channel gets read as 20 GHz.
- Audio and music production: sample rates in kHz against oscillator frequencies in Hz, where a missing factor of 1,000 detunes everything.
- Motors and machinery: RPM on the nameplate against hertz in the drive manual, where the factor of 60 is applied the wrong way.
- Coursework and exams: answers that are numerically right but in the wrong unit, which markers reasonably count as wrong.
CodexFuse replaces that patchwork with one fully managed platform on credits: hosting, business email, security and backups handled for you, so a frequency check is the hardest part of your day, not server babysitting.
Get Started with CodexFuseWhat this tool does not do — and what to use instead
Honesty matters here, because a unit converter is often mistaken for something bigger. This tool converts numbers between frequency units. It does not take a period as an input, so for period-to-frequency work you must first compute 1 divided by the period yourself: a 1 ms period (0.001 s) is 1 kHz, and a 60 Hz signal has a period of about 16.67 ms.
It also does not convert frequency to wavelength on its own, because wavelength needs a wave speed (wavelength equals speed divided by frequency). For that, use a dedicated wavelength calculator. And it is not an AC frequency changer: industrial hardware that changes the frequency of mains power for motors is a rectifier plus an inverter, not a number converter. Confusing the two leads to expensive misunderstandings.
Finally, the tool gives you a mathematically exact conversion, not a measurement. If your signal generator is miscalibrated, the converter will faithfully convert the wrong input. Trust the maths, but verify the source number.
From one-off conversions to a managed setup that stops the subscription shuffle
CodexFuse takes the opposite approach: one fully managed, all-in-one platform that runs on credits instead of subscriptions. The practical workflow looks like this:
- Start with the pain: list the services you currently pay for separately — hosting, business email, security, backups — and the renewal dates you keep missing.
- Move them in one place: set up the equivalent services on CodexFuse, where the platform manages the servers and updates for you rather than handing you a control panel to babysit.
- Pay with credits: top up credits and use them across services as you need them, with no monthly lock-in for a service you barely use.
- Keep the free tools free: converters like this frequency converter stay available for day-to-day work, alongside the managed services that carry the business.
If you convert units often, bookmark these companions: the flow rate converter for litres and cubic metres, the force converter for newtons and pounds-force, and the Fahrenheit to Celsius converter for temperature work.
Frequently Asked Questions
How do I convert MHz to Hz?
Multiply megahertz by 1,000,000. So 1 MHz equals 1,000,000 Hz, 100 MHz equals 100,000,000 Hz, and 2.4 GHz equals 2,400 MHz before it equals 2,400,000,000 Hz. Moving to a smaller unit always multiplies; moving to a larger unit always divides.
How do I convert RPM to Hz?
Divide RPM by 60. So 1,800 RPM equals 30 Hz, 3,600 RPM equals 60 Hz, and 60 RPM equals 1 Hz. Revolutions per second is the same as hertz, so 1 rps equals 1 Hz by definition.
How do I convert rad/s to Hz?
Divide radians per second by 2π (about 6.283). So 6.283 rad/s is about 1 Hz, and 1 Hz equals 360 degrees per second. Angular velocity and frequency describe the same rotation in different units.
Can a frequency converter change mains power frequency?
No. A frequency converter tool only converts numbers between units. Changing the actual frequency of mains power needs industrial frequency-changer hardware, typically a rectifier plus an inverter, sized for the motor load. Do not confuse the two.
What is the difference between frequency and period?
Frequency is cycles per second; period is seconds per cycle. They are reciprocals: frequency equals 1 divided by period. A 60 Hz signal has a period of about 16.67 ms, and a signal with a 1 ms period has a frequency of 1 kHz.
Is the CodexFuse frequency converter free?
Yes, the converter itself is free to use in your browser, with all nine units and the All conversions panel included. Note that the tool page asks you to log in to use it, so keep a free CodexFuse account handy if prompted.
Convert first, decide second — then stop babysitting servers
A frequency converter will not fix a bad design or a miscalibrated instrument, but it removes the most common source of unit errors: rushed mental arithmetic across kHz, MHz, GHz, RPM and rad/s. Convert the number, check it in a second unit, copy it once, and move on.
If the same kind of friction is eating your business — separate subscriptions for hosting, email, security and backups, each demanding attention — move the whole stack to CodexFuse. Set up your hosting, business email, security and backups on one fully managed platform, pay with credits instead of subscriptions, and let the platform handle the server work. Start today, and make unit conversions the only maths you have to think about.