Frequency Converter
Convert between Hz, kHz, MHz, GHz and RPM.
Gigahertz (GHz)
2.4
from 2,400 Megahertz (MHz)
Hertz (Hz)
2,400,000,000
Kilohertz (kHz)
2,400,000
Megahertz (MHz)
2,400
RPM
144,000,000,000
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How the Frequency Converter works
This frequency converter instantly converts between the most common frequency units — Hz, kHz, MHz, GHz, and RPM — making it essential for engineers, radio enthusiasts, motor technicians, and students who need precise, fast unit translation without manual calculation errors.
Frequency describes how many times a repeating event occurs per second, and the International System of Units (SI) defines the hertz (Hz) as the base unit, where 1 Hz equals one cycle per second. All other electrical frequency units — kHz, MHz, and GHz — are simply decimal multiples of the hertz: a kilohertz is 1,000 Hz, a megahertz is 1,000,000 Hz, and a gigahertz is 1,000,000,000 Hz. The converter takes your input value, converts it to hertz as an intermediate baseline, and then scales it precisely to whatever target unit you need.
RPM (revolutions per minute) is a mechanical frequency unit used to describe rotational speed rather than electrical oscillation. Converting between RPM and Hz requires accounting for the time-base difference: RPM measures cycles per minute while Hz measures cycles per second. The relationship is straightforward — divide RPM by 60 to get Hz, or multiply Hz by 60 to get RPM. This conversion is critical in motor control, engine diagnostics, and any application where a mechanical rotation must be synchronized with an electrical signal, such as in variable frequency drives (VFDs).
A common source of confusion is conflating frequency with other wave properties like wavelength or period. Frequency and period are reciprocals of each other (Period = 1 / Frequency), and wavelength depends on the speed of propagation of the wave through a medium. This converter focuses purely on frequency unit conversion, so if you need wavelength or period calculations, those require additional formulas. For RF and wireless work, knowing that a 2.4 GHz Wi-Fi signal equals 2,400,000,000 Hz or 2,400 MHz helps ground abstract GHz numbers in more tangible terms.
Precision matters significantly in frequency work. At radio frequencies, being off by even a fraction of a MHz can mean operating outside a licensed band or causing interference. At the mechanical end, an error in RPM-to-Hz conversion can result in a motor running at the wrong speed, causing equipment damage or safety hazards. Always verify that your source unit matches the context — for example, some European motor datasheets express speed in Hz (supply frequency) rather than RPM, which can be misread. Using a reliable frequency converter eliminates transcription errors and ensures you're working with exact scaled values.
Formula
Hz = kHz × 1,000 | Hz = MHz × 1,000,000 | Hz = GHz × 1,000,000,000 | Hz = RPM ÷ 60 | RPM = Hz × 60
Pro tips
- When working with variable frequency drives (VFDs), always convert your target motor RPM to Hz first using RPM ÷ 60, then verify it falls within the drive's rated output frequency range before programming.
- For RF antenna design and radio work, remember that 1 MHz is often a more human-readable unit than raw Hz — use MHz as your working unit to reduce zero-counting errors when reading datasheets.
- If you're dealing with processor or oscillator datasheets that list frequencies in GHz, convert to MHz before comparing with legacy components rated in MHz to avoid mismatched scaling by a factor of 1,000.
- When converting RPM to Hz for motor synchronization, note that a standard 4-pole AC motor in a 60 Hz country runs at approximately 1,800 RPM (synchronous speed), giving you a practical sanity-check reference point.
- Always confirm which frequency unit your measuring instrument outputs — oscilloscopes and spectrum analyzers may display in Hz, kHz, or MHz depending on range settings, and misreading the unit prefix is one of the most common field errors.
Key terms
- Hertz (Hz)
- — The SI base unit of frequency, equal to one complete cycle or oscillation per second.
- Kilohertz (kHz)
- — A unit of frequency equal to 1,000 Hz, commonly used for AM radio broadcasts and audio signals.
- Megahertz (MHz)
- — A unit of frequency equal to 1,000,000 Hz, widely used for FM radio, CPU clock speeds, and RF communications.
- Gigahertz (GHz)
- — A unit of frequency equal to 1,000,000,000 Hz, used to describe microwave signals, Wi-Fi bands, and modern processor speeds.
- RPM (Revolutions Per Minute)
- — A mechanical frequency unit expressing how many full rotations an object completes in one minute, converted to Hz by dividing by 60.
- Period
- — The time duration of one complete cycle, equal to the reciprocal of frequency (Period = 1 ÷ Hz), measured in seconds.
