Kilohertz to Hertz
An instant kilohertz-to-hertz converter, with the formula and a reference table below.
| Kilohertz | Hertz |
|---|---|
| 1 kHz | 1000 Hz |
| 2 kHz | 2000 Hz |
| 3 kHz | 3000 Hz |
| 5 kHz | 5000 Hz |
| 10 kHz | 10000 Hz |
| 25 kHz | 25000 Hz |
| 50 kHz | 50000 Hz |
| 100 kHz | 100000 Hz |
How to use
- Enter a value in the Kilohertz field.
- The Hertz figure appears immediately — no button to press.
- Typing in the Hertz field converts back to Kilohertz the same way.
- Use the reference table for the values that come up most often.
Kilohertz to Hertz formula
The factor from kilohertz to hertz is 1000.
Hz = kHz × 1000
Put another way, one kilohertz is exactly 1,000 hertz.
Why this factor: the kilohertz and the hertz are both defined against the hertz, so dividing one definition by the other gives 1000 directly. Both definitions are set out in full below.
To go the other way, divide by 1000 — or use the Hertz to Kilohertz converter, which is the same calculation reversed.
Worked example
Start with 1000 kHz. Multiply by 1000 to get 1000000 Hz.
1000 kHz × 1000 = 1000000 Hz
The converter above does this for any value you type, in either direction.
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.
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.
Kilohertz vs Hertz
The kilohertz is a metric unit while the hertz is an SI 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 hertz are in a kilohertz?
One kilohertz equals 1000 hertz.
What is the formula to convert kilohertz to hertz?
Multiply the number of kilohertz by 1000. To reverse it, divide by 1000 instead.
How do I convert hertz back to kilohertz?
Divide by 1000, which is the same as multiplying by 0.001.
How many hertz are in 10 kilohertz?
10 kHz works out to 10000 Hz.
How is the kilohertz defined?
Exactly 1,000 hertz.