# Gigahertz to Megahertz (GHz to MHz)

> Convert gigahertz to megahertz: 1 GHz = 1000 MHz. Exact conversion factor, formula, 22-row table and worked examples, with JSON API and MCP access.

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

## Formula

- `1 GHz = 1000 MHz`
- `megahertz = gigahertz × 1000`
- Reverse: `gigahertz = megahertz × 0.001`

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 GHz = 5000 MHz
- 12.5 GHz = 12500 MHz
- 100 GHz = 100000 MHz

## Conversion table

| Gigahertz (GHz) | Megahertz (MHz) |
| --- | --- |
| 1 | 1000 |
| 2 | 2000 |
| 3 | 3000 |
| 4 | 4000 |
| 5 | 5000 |
| 6 | 6000 |
| 7 | 7000 |
| 8 | 8000 |
| 9 | 9000 |
| 10 | 10000 |
| 15 | 15000 |
| 20 | 20000 |
| 25 | 25000 |
| 30 | 30000 |
| 40 | 40000 |
| 50 | 50000 |
| 75 | 75000 |
| 100 | 100000 |
| 200 | 200000 |
| 250 | 250000 |
| 500 | 500000 |
| 1000 | 1000000 |

## API

- `GET https://tttkmbb.com/api/v1/convert?value=5&from_unit=GHz&to_unit=MHz` → 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":"GHz","to_unit":"MHz"}`
- 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 megahertz are in one gigahertz?**

1 GHz = 1000 MHz. 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 gigahertz to megahertz?**

Multiply the value in gigahertz by 1000: megahertz = gigahertz × 1000. For example, 5 GHz = 5000 MHz.

**How do I convert megahertz back to gigahertz?**

Multiply by the inverse factor 0.001 (gigahertz = megahertz × 0.001), or use the megahertz-to-gigahertz page.

## Related conversions

- [Megahertz to gigahertz](https://tttkmbb.com/conversion/mhz-to-ghz.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)
- [Megahertz to Kilohertz](https://tttkmbb.com/conversion/mhz-to-khz.md)
- [Kilohertz to Megahertz](https://tttkmbb.com/conversion/khz-to-mhz.md)
- [Kilohertz to Hertz](https://tttkmbb.com/conversion/khz-to-hz.md)
- [Hertz to Kilohertz](https://tttkmbb.com/conversion/hz-to-khz.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)