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Hz to THz Converter

Convert hertz to terahertz instantly. 1 Hz = 1.000000e-12 THz, worked steps and a full reference table.

Formula
THz = Hz × 1.000000e-12

How to use it

  • Type the value in hertz — 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 Hz1.000000e-12 THz
5 Hz5.000000e-12 THz
10 Hz1.000000e-11 THz
100 Hz1.000000e-10 THz

One hertz equals 1.0000e-12 terahertzes (THz). To convert hertzes to terahertzes, multiply by 1.0000e-12; to go back the other way, multiply by 1.0000e+12 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 hertzes and terahertzes actually measure

Hertz (Hz) — The hertz is one cycle per second. Mains supply, audio pitch and refresh rates.

Terahertz (THz) — A terahertz is a trillion hertz. Infrared and far-infrared spectroscopy.

Hz to THz conversion table

The most common values, worked out in advance. Anything not listed can be typed straight into the converter.

HzTHz
1 Hz1.0000e-12 THz
2 Hz2.0000e-12 THz
5 Hz5.0000e-12 THz
10 Hz1.0000e-11 THz
25 Hz2.5000e-11 THz
50 Hz5.0000e-11 THz
100 Hz1.0000e-10 THz

How to convert hertzes to terahertzes by hand

Multiply the number of hertzes by 1.0000e-12.

For example, 25 Hz × 1.0000e-12 = 2.5000e-11 THz.

Going the other way, divide by 1.0000e-12 — or multiply by 1.0000e+12, 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 THz are in 1 Hz?

1 Hz equals exactly 1.000000e-12 THz. Multiply any value in hertz by 1.000000e-12 to get terahertz.

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.

Runs entirely in your browser. Nothing you type is uploaded, logged or shared.

Last updated 18 August 2026