THz to GHz Converter
Convert terahertz to gigahertz instantly. 1 THz = 1000 GHz, worked steps and a full reference table.
How to use it
- Type the value in terahertz — the result updates as you type.
- Use Swap to flip the direction, or change either dropdown to convert between any two units.
- Click the result to copy it. The URL updates too, so you can bookmark or share the exact conversion.
Examples
| 1 THz | 1000 GHz |
| 5 THz | 5000 GHz |
| 10 THz | 10000 GHz |
| 100 THz | 100000 GHz |
One terahertz equals 1000 gigahertzes (GHz). To convert terahertzes to gigahertzes, multiply by 1000; to go back the other way, multiply by 0.001 instead.
The converter above does it as you type and shows the working underneath, so you can check the arithmetic rather than take the number on trust.
What terahertzes and gigahertzes actually measure
Terahertz (THz) — A terahertz is a trillion hertz. Infrared and far-infrared spectroscopy.
Gigahertz (GHz) — A gigahertz is a billion hertz. Processor clocks, Wi-Fi bands and mobile networks.
THz to GHz conversion table
The most common values, worked out in advance. Anything not listed can be typed straight into the converter.
| THz | GHz |
|---|---|
| 1 THz | 1000 GHz |
| 2 THz | 2000 GHz |
| 5 THz | 5000 GHz |
| 10 THz | 10000 GHz |
| 25 THz | 25000 GHz |
| 50 THz | 50000 GHz |
| 100 THz | 100000 GHz |
How to convert terahertzes to gigahertzes by hand
Multiply the number of terahertzes by 1000.
For example, 25 THz × 1000 = 25000 GHz.
Going the other way, divide by 1000 — or multiply by 0.001, which is the same thing and easier to do in your head.
Everything runs in your browser
There is no server involved in the calculation. The numbers you type never leave your device, nothing is logged, and the page keeps working with no connection once it has loaded. That is not a marketing line — it is simply how the tool is built, because a calculation like this has no reason to touch a network.
Questions people ask
How many GHz are in 1 THz?
1 THz equals exactly 1000 GHz. Multiply any value in terahertz by 1000 to get gigahertz.
Is anything uploaded to a server?
No. The whole calculation happens in your browser. Nothing is sent anywhere, and the page keeps working offline once loaded.
Last updated 18 August 2026