Hertz to Kilohertz
Convert hertz to kilohertz instantly — one hertz is 0.001 kilohertz.
| Hertz | Kilohertz |
|---|---|
| 1 Hz | 0.001 kHz |
| 2 Hz | 0.002 kHz |
| 3 Hz | 0.003 kHz |
| 5 Hz | 0.005 kHz |
| 10 Hz | 0.01 kHz |
| 25 Hz | 0.025 kHz |
| 50 Hz | 0.05 kHz |
| 100 Hz | 0.1 kHz |
How to use
- Enter a value in the Hertz field.
- The Kilohertz figure appears immediately — no button to press.
- Typing in the Kilohertz field converts back to Hertz the same way.
- Use the reference table for the values that come up most often.
Hertz to Kilohertz formula
The factor from hertz to kilohertz is 0.001.
kHz = Hz × 0.001
Put another way, one hertz is exactly 1/1,000 of a kilohertz.
Why this factor: the hertz and the kilohertz are both defined against the hertz, so dividing one definition by the other gives 0.001 directly. Both definitions are set out in full below.
To go the other way, divide by 0.001 — or use the Kilohertz to Hertz converter, which is the same calculation reversed.
Worked example
Given 50 Hz, multiplying by 0.001 yields 0.05 kHz.
50 Hz × 0.001 = 0.05 kHz
The converter above does this for any value you type, in either direction.
What is a hertz?
The hertz is the SI unit of frequency — one cycle per second.
Definition: Defined as one reciprocal second (s⁻¹). Named after Heinrich Hertz.
Where it is used: Mains electricity (50 or 60 Hz), audio frequencies, and display refresh rates.
What is a kilohertz?
A kilohertz is 1,000 cycles per second.
Definition: Exactly 1,000 hertz.
Where it is used: AM radio frequencies, audio sample rates (44.1 kHz for CD audio), and ultrasonic ranges.
Hertz vs Kilohertz
The hertz is an SI unit while the kilohertz is a metric unit. That is why the factor between them is not a round number: the two systems were defined independently and only later tied together by exact agreement.
Frequently asked questions
How many kilohertz are in a hertz?
One hertz equals 0.001 kilohertz.
What is the formula to convert hertz to kilohertz?
Multiply the number of hertz by 0.001. To reverse it, divide by 0.001 instead.
How do I convert kilohertz back to hertz?
Divide by 0.001, which is the same as multiplying by 1000.
How many kilohertz are in 10 hertz?
10 Hz works out to 0.01 kHz.
How is the hertz defined?
Defined as one reciprocal second (s⁻¹). Named after Heinrich Hertz.