Terahertz is 1000000000000 hertz units.
Terahertz to Petahertz Converter — THz to PHz
Convert Terahertz (THz) to Petahertz (PHz) using the exact conversion factor (1 terahertz = 0.001 petahertz). See the formula, worked examples, and conversion table.
Terahertz to Petahertz converter
Converter
Scientific Units Converter
Convert SI derived units, scientific notation-friendly units, atomic units, and lab measurements.
Context values
Some unit families need one extra value for a physically accurate result.
Petahertz is 1000000000000000 hertz units.
Result = input x 1e+12 / 1e+15.
Frequency units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Terahertz to Petahertz
Terahertz and Petahertz are both scientific-measurement units, spanning everything from atomic and laboratory scales to astronomical distances — the kind of conversion that comes up constantly in physics, chemistry, and astronomy when a result needs to move between conventions used in different subfields. Specifically: Terahertz is 1000000000000 hertz units, and petahertz is 1000000000000000 hertz units.
Formula
petahertz = terahertz × 0.001
This factor comes from each unit's defined relationship to the category's base unit: 1 terahertz equals 1e+12 base units, and 1 petahertz equals 1e+15 base units, so dividing one by the other gives the direct terahertz-to-petahertz factor of 0.001.
Simple example
1 THz × 0.001 = 0.001 PHz
1 terahertz = 0.001 petahertz.
Real-world example
10 THz × 0.001 = 0.01 PHz
10 terahertz = 0.01 petahertz.
Conversion table
| Terahertz (THz) | Petahertz (PHz) |
|---|---|
| 0.001 THz | 0.000001 PHz |
| 0.01 THz | 0.00001 PHz |
| 1 THz | 0.001 PHz |
| 10 THz | 0.01 PHz |
| 100 THz | 0.1 PHz |
| 1,000 THz | 1 PHz |
Reverse conversion: Petahertz to Terahertz
0.001 PHz × 1000 = 1 THz
0.001 petahertz = 1 terahertz.
terahertz = petahertz × 1000
For a page dedicated to this direction, see Petahertz to Terahertz.
Understanding the Terahertz (THz)
Terahertz is 1000000000000 hertz units.
Understanding the Petahertz (PHz)
Petahertz is 1000000000000000 hertz units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many petahertz are in 1 terahertz?
1 terahertz equals 0.001 petahertz, using the exact defined conversion factor rather than an estimate.
How do I convert terahertz to petahertz?
Multiply the terahertz value by 0.001. The converter above does this instantly to whatever precision you set.
How do I convert petahertz back to terahertz?
Use the reverse factor: 1 petahertz equals 1,000 terahertz. You can also use the swap control in the converter above to flip the direction instantly.
What is a terahertz?
Terahertz (THz) is a unit of scientific units.
What is a petahertz?
Petahertz (PHz) is a unit of scientific units.
Is the terahertz to petahertz conversion exact?
Yes. Both terahertz and petahertz are defined by fixed standards rather than physical artifacts, so the factor of 0.001 used above is exact to as many digits as you choose to display.
Why does this category span everything from atomic to astronomical scales?
Scientific work spans an enormous range of physical scales, from atomic distances (measured in angstroms or atomic mass units) to interstellar distances (measured in astronomical units or parsecs), so this category groups SI-derived and scale-specific units that researchers commonly need to convert between within their field.