A parsec is about 3.26156 light-years.
Parsecs to Petameters Converter — pc to Pm
Convert Parsec (pc) to Petameter (Pm) using the exact conversion factor (1 parsec = 30.85677581 petameter). See the formula, worked examples, conversion table, history, and common uses.
Parsecs to Petameters converter
Converter
Length Converter
Convert SI, imperial, US customary, astronomical, scientific, and historical length units.
Context values
Some unit families need one extra value for a physically accurate result.
Petameter is 1000000000000000 meter units.
Result = input x 3.08567758e+16 / 1e+15.
Length uses the meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Parsecs to Petameters
Parsec and Petameter both measure length. Parsec is most often used for measuring distances to nearby stars via parallax.
Formula
petameters = parsecs × 30.8567758149
This factor comes from each unit's defined relationship to the category's base unit: 1 parsec equals 3.085678e+16 base units, and 1 petameter equals 1e+15 base units, so dividing one by the other gives the direct parsec-to-petameter factor of 30.8567758149.
Simple example
1 pc × 30.85677581 = 30.85677581 Pm
1 parsec = 30.85677581 petameters.
Real-world example
10 pc × 30.85677581 = 308.5677581 Pm
10 parsecs = 308.5677581 petameters.
Conversion table
| Parsec (pc) | Petameter (Pm) |
|---|---|
| 1 pc | 30.85677581 Pm |
| 5 pc | 154.2838791 Pm |
| 10 pc | 308.5677581 Pm |
| 21.0975 pc | 651.0008278 Pm |
| 42.195 pc | 1,302.001656 Pm |
| 100 pc | 3,085.677581 Pm |
Reverse conversion: Petameter to Parsec
30.85677581 Pm × 0.03240779289 = 0.9999999998 pc
30.85677581 petameters = 0.9999999998 parsecs.
parsecs = petameters × 0.0324077928944
For a page dedicated to this direction, see Petameter to Parsec.
Understanding the Parsec
Parsec (pc) measures astronomical distance. The distance at which one astronomical unit subtends an angle of one arcsecond — approximately 3.26 light-years, or about 3.086 × 10¹⁶ meters. It is classified as a non-SI unit used in astronomy.
Where it's used: Standard distance unit throughout professional astronomy worldwide
Uses of the Parsec today
- Measuring distances to nearby stars via parallax
- Galactic and extragalactic distance scales in astrophysics research
History of the Parsec
The name is a portmanteau of 'parallax' and 'arcsecond,' reflecting how the unit is defined directly from the parallax method astronomers use to measure stellar distances: the tiny apparent shift in a nearby star's position as Earth orbits the Sun.
Historical origin. Parsec was not the invention of a single named person; it developed through the process described above.
Understanding the Petameter (Pm)
Petameter is 1000000000000000 meter units.
Parsec — sources
- IAU (International Astronomical Union) — parsec definition — Standard astronomical definition of the parsec via stellar parallax.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many petameters are in 1 parsec?
1 parsec equals 30.85677581 petameters, using the exact defined conversion factor rather than an estimate.
How do I convert parsec to petameter?
Multiply the parsec value by 30.85677581. The converter above does this instantly to whatever precision you set.
How do I convert petameter back to parsec?
Use the reverse factor: 1 petameter equals 0.0324077929 parsecs. You can also use the swap control in the converter above to flip the direction instantly.
What is a parsec?
Parsec (pc) measures astronomical distance. The distance at which one astronomical unit subtends an angle of one arcsecond — approximately 3.26 light-years, or about 3.086 × 10¹⁶ meters. It is classified as a non-SI unit used in astronomy.
What is a petameter?
Petameter (Pm) is a unit of length.
Is the parsec to petameter conversion exact?
Yes. Both parsec and petameter are defined by fixed standards rather than physical artifacts, so the factor of 30.85677581 used above is exact to as many digits as you choose to display.
Where is the parsec still used today?
Standard distance unit throughout professional astronomy worldwide