Skip to main content

Hertz to Terahertz Converter
↔ Convert THz to Hz instead

Common Conversions

Hz THz
100000000000 0.1
500000000000 0.5
1000000000000 1
2000000000000 2
5000000000000 5
10000000000000 10
25000000000000 25
50000000000000 50
100000000000000 100
1000000000000000 1000

Why this conversion matters in chemistry

Terahertz time-domain spectroscopy probes molecular-scale vibrations from 0.1 to 10 THz — the regime where intermolecular hydrogen-bonding networks and skeletal phonon modes show up. The technique discriminates pharmaceutical polymorphs by their distinct lattice-mode fingerprints. A 1 THz resonance is 1 × 10¹² Hz, equivalently 33.4 cm⁻¹ in FTIR wavenumbers and 4.14 meV in photon energy. The ratio of 10⁻¹² THz per Hz is just the tera prefix. The conversion is mostly bookkeeping that takes a raw frequency-counter reading into the THz form a far-infrared spectrum is plotted in.

Formula

THz = Hz × 10⁻¹² (equivalently, THz = Hz ÷ 10¹²)

Worked Examples

1000000000000 Hz = 1 THz

The conversion anchor — the lower edge of the far-IR region.

10000000000000 Hz = 10 THz

10 THz — the upper end of the THz window, transitioning into mid-IR.

300000000000 Hz = 0.3 THz

The microwave-THz boundary, where rotational spectroscopy starts to overlap with vibrational modes.

Frequently Asked Questions

How do I convert Hz to THz?
Divide by 10¹² (one trillion). The C–H stretch at about 9 × 10¹³ Hz equals 90 THz. The relationship is exact through the tera prefix.
How does THz relate to wavelength?
ν = c/λ, so 1 THz corresponds to a wavelength of about 300 µm and 10 THz to about 30 µm. The THz window sits between microwave (mm wavelengths) and mid-infrared (3–30 µm) on the electromagnetic spectrum.
What does THz spectroscopy probe?
Low-frequency intermolecular vibrations, hydrogen-bond networks, crystal lattice modes, and large-amplitude torsional motions. The technique is particularly useful for distinguishing pharmaceutical polymorphs and characterising hydration shells of biomolecules — both produce distinct fingerprints in the 0.1–10 THz range.