Convert Terahertz to Gigahertz
1 terahertz is 1,000 GHz. One terahertz is exactly 1000 gigahertz.
One terahertz is 1000 gigahertz. To convert terahertz to gigahertz, 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 trillion hertz.
Factor checked against the defining standard · How we check
- Terahertz × 1000
1 * 10001,000 GHz
1 terahertz in every frequency unit
| Unit | Value | Exact factor |
|---|---|---|
| hertz | 1,000,000,000,000 Hz | × 1,000,000,000,000 |
| kilohertz | 1,000,000,000 kHz | × 1,000,000,000 |
| megahertz | 1,000,000 MHz | × 1,000,000 |
| gigahertz | 1,000 GHz | × 1,000 |
| terahertz (as entered) | 1 THz | — |
| revolutions per minute | 60,000,000,000,000 rpm | × 60,000,000,000,000 |
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 terahertz to gigahertz? The converter and the working
- 1.Take the measurement in terahertz.
- 2.Multiply by 1000 — that is how many gigahertz fit in one terahertz.
- 3.To go back the other way, divide by 1000, or multiply by 0.001.
Worked example: 25 terahertz to gigahertz
- Formula
- THz × 1000 = GHz
- Arithmetic
- 25 × 1000 = 25,000 GHz
- Answer
- 25 THz = 25,000 GHz
The factor is exact, so this figure is exact too — only the display is rounded.
Terahertz to gigahertz conversion table
| Terahertz | Gigahertz |
|---|---|
| 1 THz | 1,000 GHz |
| 2 THz | 2,000 GHz |
| 3 THz | 3,000 GHz |
| 4 THz | 4,000 GHz |
| 5 THz | 5,000 GHz |
| 6 THz | 6,000 GHz |
| 7 THz | 7,000 GHz |
| 8 THz | 8,000 GHz |
| 9 THz | 9,000 GHz |
| 10 THz | 10,000 GHz |
| 12 THz | 12,000 GHz |
| 15 THz | 15,000 GHz |
| 20 THz | 20,000 GHz |
| 25 THz | 25,000 GHz |
| 50 THz | 50,000 GHz |
| 100 THz | 100,000 GHz |
| 200 THz | 200,000 GHz |
| 300 THz | 300,000 GHz |
| 500 THz | 500,000 GHz |
| 1000 THz | 1,000,000 GHz |
| 2000 THz | 2,000,000 GHz |
| 5000 THz | 5,000,000 GHz |
| 10000 THz | 10,000,000 GHz |
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.
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.
How many gigahertz are in a terahertz?
One terahertz is 1000 gigahertz, exactly. Going the other way, one gigahertz is 0.001 terahertz. 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 terahertz.
Source: NIST Special Publication 811 — the hertz, and SI prefixes
Cite this page
- APA
- Rule Calculator. (2026). Convert Terahertz to gigahertz. Rule Calculator. https://rulecalculators.com/convert/terahertz-to-gigahertz
- MLA
- "Convert Terahertz to gigahertz." Rule Calculator, August 16, 2026, https://rulecalculators.com/convert/terahertz-to-gigahertz.
- Chicago
- Rule Calculator. "Convert Terahertz to gigahertz." Rule Calculator. Last reviewed August 16, 2026. https://rulecalculators.com/convert/terahertz-to-gigahertz.
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Questions people actually ask
- How many gigahertz are in a terahertz?
- 1000. 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.
- How do I convert gigahertz back to terahertz?
- Divide by 1000, or multiply by 0.001 — they are the same operation.
Other frequency conversions
Gigahertz to terahertz — the same conversion the other way.