Hz to kHz Converter
Bidirectional Hertz ↔ Kilohertz converter 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.
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. AM radio dial markings use kHz; FM and TV use MHz.
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.