Hz to kHz Converter
This free Hz to kHz converter converts Hertz to kilohertz and back, with frequency-band classification, period calculation, MHz/GHz cross-reference, and common audio & radio presets. Runs entirely in your browser.
Input
Result
Common Frequency Reference
| Source / Use | Hz | kHz | Band |
|---|---|---|---|
| Infrasound (felt, not heard) | 1 – 20 | 0.001 – 0.02 | Infrasound |
| Bass guitar low E | 41.2 | 0.0412 | Audible |
| Middle C (C4) | 261.63 | 0.26163 | Audible |
| Concert A4 | 440 | 0.44 | Audible |
| Voice fundamental range | 85 – 255 | 0.085 – 0.255 | Audible |
| Vocal sibilance / "s" sounds | 5,000 – 10,000 | 5 – 10 | Audible |
| Upper hearing limit (young) | 20,000 | 20 | Audible |
| CD audio sample rate | 44,100 | 44.1 | Ultrasonic |
| Ultrasonic cleaner | 40,000 – 50,000 | 40 – 50 | Ultrasonic |
| AM radio band | 530,000 – 1,710,000 | 530 – 1,710 | RF (LF / MF) |
| Shortwave radio | 3,000,000 – 30,000,000 | 3,000 – 30,000 | RF (HF) |
| FM radio band | 87,500,000 – 108,000,000 | 87,500 – 108,000 | RF (VHF) |
About Hz, kHz & Frequency Units
One hertz (Hz) equals one cycle per second, and one kilohertz (kHz) equals one thousand hertz. The conversion is a simple decimal shift — divide Hz by 1,000 to get kHz, or multiply kHz by 1,000 to get Hz. As a general-purpose frequency unit converter, this tool handles the full range from sub-audio infrasound up through radio frequencies, with the same straightforward math throughout.
How to convert Hz to kHz: formula and worked example
The formula is a single division: kHz = Hz ÷ 1,000. In the other direction, Hz = kHz × 1,000. No logarithms, no constants — just a decimal-point shift of three places.
Worked example — convert 14,500 Hz to kHz: Take the value in hertz (14,500) and divide by 1,000. 14,500 ÷ 1,000 = 14.5 kHz. That sits in the upper treble band of human hearing, just below the typical 15–16 kHz ceiling where many adults begin to lose sensitivity. Two common reference values worth memorising: 440 Hz = 0.44 kHz (concert A, the universal tuning reference — verify it with the online tone generator) and 44,100 Hz = 44.1 kHz (CD-quality audio sample rate). For wavelength at any of these frequencies, use the wavelength calculator.
Why use kHz instead of Hz?
kHz is more compact for the audio, ultrasonic, and low-radio ranges. A 5,000 Hz tone is easier to read as "5 kHz." Audio engineers say "1 k" for 1,000 Hz when discussing EQ bands — a parametric EQ might boost at "2.5 k" or cut "harsh air" at "8 k." AM radio dial markings use kHz; FM and TV use MHz. Oscilloscopes and spectrum analyzers typically switch automatically between Hz and kHz labeling based on the measured range. To hear what any specific kHz value sounds like, the online tone generator lets you play any frequency directly in your browser.
SI Prefixes for Frequency
1 kHz = 10³ Hz · 1 MHz = 10⁶ Hz · 1 GHz = 10⁹ Hz · 1 THz = 10¹² Hz. Each prefix represents three orders of magnitude, so going from Hz to kHz to MHz to GHz simply moves the decimal point three places at a time. Knowing the frequency in kHz also lets you calculate wavelength — for sound in air, wavelength (m) = 344 ÷ frequency (Hz), so a 1 kHz tone has a wavelength of about 34.4 cm. For radio waves, wavelength (m) = 300,000 ÷ frequency (kHz). Use the wavelength calculator for precise values across different media.
kHz in audio sampling and digital audio
In digital audio, sample rate is always expressed in kHz. The most common rates are 44.1 kHz (CD standard, chosen for compatibility with early video formats), 48 kHz (broadcast and video production standard), 88.2 kHz and 96 kHz (high-resolution recording), and 192 kHz (archival mastering). The Nyquist theorem requires the sample rate to be at least twice the highest frequency you want to reproduce — so 44.1 kHz can faithfully capture audio up to 22,050 Hz, just above the typical human hearing limit of 20 kHz. Ultrasonic applications like bat-call analysis or non-destructive testing use sample rates of 200 kHz to 1 MHz or more.