Convert Gigahertz to Megahertz
1 gigahertz is 1,000 MHz. One gigahertz is exactly 1000 megahertz.
One gigahertz is 1000 megahertz. To convert gigahertz to megahertz, multiply by 1000; to go the other way, divide by 1000 or multiply by 0.001. The factor is exact rather than rounded: it follows from NIST Special Publication 811. A billion hertz.
Factor checked against the defining standard · How we check
- Gigahertz × 1000
1 * 10001,000 MHz
1 gigahertz in every frequency unit
| Unit | Value | Exact factor |
|---|---|---|
| hertz | 1,000,000,000 Hz | × 1,000,000,000 |
| kilohertz | 1,000,000 kHz | × 1,000,000 |
| megahertz | 1,000 MHz | × 1,000 |
| gigahertz (as entered) | 1 GHz | — |
| terahertz | 0.001 THz | × 0.001 |
| revolutions per minute | 60,000,000,000 rpm | × 60,000,000,000 |
Factors are entered by hand from NIST Special Publication 811 rather than derived from a units library, so the ones that terminate are exact rather than rounded.
How do you convert gigahertz to megahertz? The converter and the working
- 1.Take the measurement in gigahertz.
- 2.Multiply by 1000 — that is how many megahertz fit in one gigahertz.
- 3.To go back the other way, divide by 1000, or multiply by 0.001.
Worked example: 25 gigahertz to megahertz
- Formula
- GHz × 1000 = MHz
- Arithmetic
- 25 × 1000 = 25,000 MHz
- Answer
- 25 GHz = 25,000 MHz
The factor is exact, so this figure is exact too — only the display is rounded.
Gigahertz to megahertz conversion table
| Gigahertz | Megahertz |
|---|---|
| 1 GHz | 1,000 MHz |
| 2 GHz | 2,000 MHz |
| 3 GHz | 3,000 MHz |
| 4 GHz | 4,000 MHz |
| 5 GHz | 5,000 MHz |
| 6 GHz | 6,000 MHz |
| 7 GHz | 7,000 MHz |
| 8 GHz | 8,000 MHz |
| 9 GHz | 9,000 MHz |
| 10 GHz | 10,000 MHz |
| 12 GHz | 12,000 MHz |
| 15 GHz | 15,000 MHz |
| 20 GHz | 20,000 MHz |
| 25 GHz | 25,000 MHz |
| 50 GHz | 50,000 MHz |
| 100 GHz | 100,000 MHz |
| 200 GHz | 200,000 MHz |
| 300 GHz | 300,000 MHz |
| 500 GHz | 500,000 MHz |
| 1000 GHz | 1,000,000 MHz |
| 2000 GHz | 2,000,000 MHz |
| 5000 GHz | 5,000,000 MHz |
| 10000 GHz | 10,000,000 MHz |
What is a gigahertz?
A billion hertz. Wi-Fi runs at 2.4 and 5 GHz, and a processor clock has been quoted in these since about 2000 — a 3.5 GHz core starts a new cycle every 286 picoseconds.
What is a megahertz?
A million hertz. FM radio sits at 88 to 108 MHz, and a processor clock was quoted here until the late 1990s.
How many megahertz are in a gigahertz?
One gigahertz is 1000 megahertz, exactly. Going the other way, one megahertz is 0.001 gigahertz. Both figures come from the same defined relation rather than from a measurement, which is why they are the same today as they were in 1959.
Every frequency unit here
The whole group — 6 units with their symbols and the size of each one in hertzs — is on the conversion index, along with every pair it makes. The table above already gives each of them relative to a gigahertz.
Source: NIST Special Publication 811 — the hertz, and SI prefixes
Cite this page
- APA
- Rule Calculator. (2026). Convert Gigahertz to megahertz. Rule Calculator. https://rulecalculators.com/convert/gigahertz-to-megahertz
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- "Convert Gigahertz to megahertz." Rule Calculator, August 16, 2026, https://rulecalculators.com/convert/gigahertz-to-megahertz.
- Chicago
- Rule Calculator. "Convert Gigahertz to megahertz." Rule Calculator. Last reviewed August 16, 2026. https://rulecalculators.com/convert/gigahertz-to-megahertz.
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Questions people actually ask
- How many megahertz are in a gigahertz?
- 1000. A million hertz. FM radio sits at 88 to 108 MHz, and a processor clock was quoted here until the late 1990s.
- How do I convert megahertz back to gigahertz?
- Divide by 1000, or multiply by 0.001 — they are the same operation.
Other frequency conversions
Megahertz to gigahertz — the same conversion the other way.