# Hertz to Kilohertz (Hz to kHz)

> Convert hertz to kilohertz: 1 Hz = 0.001 kHz. Exact conversion factor, formula, 22-row table and worked examples, with JSON API and MCP access.

- Page id: `hz-to-khz` · Quantity: Frequency (`frequency`, base unit Hz) · Tool: `convert_units`
- Canonical page: https://tttkmbb.com/conversion/hz-to-khz · This document: https://tttkmbb.com/conversion/hz-to-khz.md · JSON: https://tttkmbb.com/conversion/hz-to-khz.json (add `?value=` for a result)

## Formula

- `1 Hz = 0.001 kHz`
- `kilohertz = hertz × 0.001`
- Reverse: `hertz = kilohertz × 1000`

The factor follows from the SI definitions of both units (NIST SP 811); values below are rounded to 6 significant figures, the API returns up to 12.

## Worked examples

- 5 Hz = 0.005 kHz
- 12.5 Hz = 0.0125 kHz
- 100 Hz = 0.1 kHz

## Conversion table

| Hertz (Hz) | Kilohertz (kHz) |
| --- | --- |
| 1 | 0.001 |
| 2 | 0.002 |
| 3 | 0.003 |
| 4 | 0.004 |
| 5 | 0.005 |
| 6 | 0.006 |
| 7 | 0.007 |
| 8 | 0.008 |
| 9 | 0.009 |
| 10 | 0.01 |
| 15 | 0.015 |
| 20 | 0.02 |
| 25 | 0.025 |
| 30 | 0.03 |
| 40 | 0.04 |
| 50 | 0.05 |
| 75 | 0.075 |
| 100 | 0.1 |
| 200 | 0.2 |
| 250 | 0.25 |
| 500 | 0.5 |
| 1000 | 1 |

## API

- `GET https://tttkmbb.com/api/v1/convert?value=5&from_unit=Hz&to_unit=kHz` → unified JSON envelope with `result.values.result`, `formula`, `factor`, `sources`, `freshness`
- MCP: server `https://tttkmbb.com/mcp`, tool `convert_units` with `{"value":5,"from_unit":"Hz","to_unit":"kHz"}`
- All frequency units: https://tttkmbb.com/api/v1/units?quantity=frequency · full converter: [Frequency Converter](https://tttkmbb.com/conversion/frequency.md)
- Authentication: none. Freshness: `static` (fixed conversion factors).

## FAQ

**How many kilohertz are in one hertz?**

1 Hz = 0.001 kHz. The factor comes from the SI definitions of both units (NIST SP 811 / BIPM), so it is exact or correct to at least 10 significant figures.

**What is the formula to convert hertz to kilohertz?**

Multiply the value in hertz by 0.001: kilohertz = hertz × 0.001. For example, 5 Hz = 0.005 kHz.

**How do I convert kilohertz back to hertz?**

Multiply by the inverse factor 1000 (hertz = kilohertz × 1000), or use the kilohertz-to-hertz page.

## Related conversions

- [Kilohertz to hertz](https://tttkmbb.com/conversion/khz-to-hz.md) (reverse)
- [Hertz to Revolutions per minute (rpm)](https://tttkmbb.com/conversion/hz-to-rpm.md)
- [Revolutions per minute (rpm) to Hertz](https://tttkmbb.com/conversion/rpm-to-hz.md)
- [Radians per second to Revolutions per minute (rpm)](https://tttkmbb.com/conversion/rad-per-second-to-rpm.md)
- [Revolutions per minute (rpm) to Radians per second](https://tttkmbb.com/conversion/rpm-to-rad-per-second.md)
- [Gigahertz to Megahertz](https://tttkmbb.com/conversion/ghz-to-mhz.md)
- [Megahertz to Gigahertz](https://tttkmbb.com/conversion/mhz-to-ghz.md)
- [Megahertz to Kilohertz](https://tttkmbb.com/conversion/mhz-to-khz.md)
- [Kilohertz to Megahertz](https://tttkmbb.com/conversion/khz-to-mhz.md)

## Data Sources

- NIST Special Publication 811 – Guide for the Use of the International System of Units (SI), Appendix B conversion factors — https://www.nist.gov/pml/special-publication-811 (standard, retrieved 2026-09-24)
- BIPM – The International System of Units (SI Brochure, 9th edition) — https://www.bipm.org/en/publications/si-brochure (standard, retrieved 2026-09-24)
- Wikipedia – Conversion of units — https://en.wikipedia.org/wiki/Conversion_of_units (reference, retrieved 2026-09-24)