kHz to Hz
Convert kilohertz to hertz for audio engineering, oscillator design, RF specs and digital signal timing. 1 kHz = 1000 Hz, reference table included.
Last updated: May 2026
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Why kHz to Hz matters
Kilohertz and hertz represent the same quantity at different scales. The conversion is necessary when a datasheet or spec lists a frequency in kHz but the formula, tool, or register expects raw Hz. The RC filter cutoff formula f = 1 / (2πRC) uses Hz directly; oscilloscope period readouts work from Hz; audio period calculations need Hz for µs-level precision.
The formula is Hz = kHz × 1000. A 44.1 kHz sample rate is 44,100 Hz. A 10 kHz PWM frequency is 10,000 Hz. Entering the wrong scale in a formula produces a result off by a factor of 1000.
When you need this conversion
- RC filter design: the formula f = 1/(2πRC) requires Hz, datasheets often give kHz
- Audio sample rates in DAW plugins: 44.1 kHz = 44,100 Hz, 48 kHz = 48,000 Hz
- Microcontroller timer setup: clock sources often in MHz or kHz, period register expects Hz
Quick reference
| Kilohertz | Hertz |
|---|---|
| 1 | 1000 |
| 10 | 10000 |
| 44.1 | 44100 |
| 100 | 100000 |
| 1000 | 1000000 |
Related tools
Audio frequencies and sample rates in Hz and kHz
Human hearing spans roughly 20 Hz to 20,000 Hz (20 kHz). Every audio format, DAW and audio interface setting sits within or just above this range. Knowing both kHz and Hz values is useful because some software shows sample rates in kHz while others expect them in Hz.
| Application | Frequency (kHz) | Frequency (Hz) | Notes |
|---|---|---|---|
| Lower limit of human hearing | 0.02 kHz | 20 Hz | Felt more than heard; sub-bass |
| Upper limit of human hearing | 20 kHz | 20,000 Hz | Decreases with age; 16 kHz common in adults |
| CD / MP3 sample rate | 44.1 kHz | 44,100 Hz | Standard consumer audio |
| Broadcast / pro audio | 48 kHz | 48,000 Hz | Film, video production, podcasting |
| High-resolution audio | 96 kHz | 96,000 Hz | Captures ultrasound above hearing |
| Studio mastering | 192 kHz | 192,000 Hz | Used for archiving; diminishing returns for playback |
| IR remote control carrier | 38 kHz | 38,000 Hz | Standard carrier for TV / device remotes |
| AM radio band | 530-1700 kHz | 530,000-1,700,000 Hz | Amplitude modulation; convert to Hz for antenna calculations |
When calculating an RC low-pass filter to remove audio interference above 20 kHz, the cutoff formula f = 1 / (2RC) requires Hz: 20,000, not 20. Entering 20 gives a cutoff 1000 times lower, at 20 Hz, which would block most audio content.
Frequently Asked Questions
Why would I need to convert kHz to Hz?
Some tools and calculation formulas require raw Hz. The RC low-pass filter cutoff formula (f = 1 / 2πRC) uses Hz directly. Audio analysis tools often show Hz; oscilloscope frequency readouts default to Hz or MHz. Datasheets commonly list values in kHz while the formula or software expects Hz.
What is 44.1 kHz in Hz?
44,100 Hz, the standard CD and MP3 audio sample rate. Converting to Hz makes period calculations straightforward: 1 / 44,100 Hz = 22.7 µs per sample. That matters when designing anti-aliasing filters or comparing sample rates across audio interfaces.
What happens if I enter a frequency in the wrong scale?
The result is off by a factor of 1000. A 10 kHz PWM signal entered as 10 Hz appears 1000 times slower than it is. In simulation tools this produces the wrong filter cutoff, oscillator period or timer frequency. Always confirm the unit, Hz, kHz, or MHz, before entering a value into a formula or tool.
What is the relationship between kHz and human hearing?
The full range of human hearing runs from about 20 Hz (0.02 kHz) to 20,000 Hz (20 kHz). Most adults cannot hear above 16-18 kHz. Audio engineers work in kHz because the numbers are more compact: saying "a 3 kHz presence peak" is easier than "3,000 Hz." But filter and equaliser software often accepts only Hz in its formula fields, requiring the conversion. A 10 kHz high-pass filter entered as 10 Hz would pass nothing below 10 Hz, cutting everything in the useful audio range.
Why do IR remote controls use 38 kHz?
TV remotes and other IR devices modulate their signal onto a 38 kHz carrier wave. The receiver chip is tuned to demodulate only that carrier frequency, which filters out constant ambient light sources (which emit DC or 50/60 Hz flicker) and lets the remote work reliably without false triggers. When designing an IR receiver circuit with an Arduino or similar microcontroller, you set the timer to generate a 38,000 Hz (38 kHz) carrier; datasheets and library documentation may list this as either 38 kHz or 38,000 Hz depending on which is cleaner for the context.