Convert Gigahertz to Terahertz
1 gigahertz is 0.001 THz. One gigahertz is exactly 0.001 terahertz.
One gigahertz is 0.001 terahertz. To convert gigahertz to terahertz, multiply by 0.001; to go the other way, divide by 0.001 or multiply by 1000. 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 × 0.001
1 * 0.0010.001 THz
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 terahertz? The converter and the working
- 1.Take the measurement in gigahertz.
- 2.Multiply by 0.001 — that is how many terahertz fit in one gigahertz.
- 3.To go back the other way, divide by 0.001, or multiply by 1000.
Worked example: 25 gigahertz to terahertz
- Formula
- GHz × 0.001 = THz
- Arithmetic
- 25 × 0.001 = 0.03 THz
- Answer
- 25 GHz = 0.03 THz
The factor is exact, so this figure is exact too — only the display is rounded.
Gigahertz to terahertz conversion table
| Gigahertz | Terahertz |
|---|---|
| 1 GHz | 0.001 THz |
| 2 GHz | 0.002 THz |
| 3 GHz | 0.003 THz |
| 4 GHz | 0.004 THz |
| 5 GHz | 0.01 THz |
| 6 GHz | 0.01 THz |
| 7 GHz | 0.01 THz |
| 8 GHz | 0.01 THz |
| 9 GHz | 0.01 THz |
| 10 GHz | 0.01 THz |
| 12 GHz | 0.01 THz |
| 15 GHz | 0.02 THz |
| 20 GHz | 0.02 THz |
| 25 GHz | 0.03 THz |
| 50 GHz | 0.05 THz |
| 100 GHz | 0.1 THz |
| 200 GHz | 0.2 THz |
| 300 GHz | 0.3 THz |
| 500 GHz | 0.5 THz |
| 1000 GHz | 1 THz |
| 2000 GHz | 2 THz |
| 5000 GHz | 5 THz |
| 10000 GHz | 10 THz |
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 terahertz?
A trillion hertz. Visible light runs from about 400 THz at the red end to 790 THz at the violet, which is the band a wavelength in nanometers is really describing.
How many terahertz are in a gigahertz?
One gigahertz is 0.001 terahertz, exactly. Going the other way, one terahertz is 1000 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 terahertz. Rule Calculator. https://rulecalculators.com/convert/gigahertz-to-terahertz
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- "Convert Gigahertz to terahertz." Rule Calculator, August 16, 2026, https://rulecalculators.com/convert/gigahertz-to-terahertz.
- Chicago
- Rule Calculator. "Convert Gigahertz to terahertz." Rule Calculator. Last reviewed August 16, 2026. https://rulecalculators.com/convert/gigahertz-to-terahertz.
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Questions people actually ask
- How many terahertz are in a gigahertz?
- 0.001. A trillion hertz. Visible light runs from about 400 THz at the red end to 790 THz at the violet, which is the band a wavelength in nanometers is really describing.
- How do I convert terahertz back to gigahertz?
- Divide by 0.001, or multiply by 1000 — they are the same operation.
Other frequency conversions
Terahertz to gigahertz — the same conversion the other way.