A parsec is about 3.26156 light-years.
Parsecs to Zettameters Converter — pc to Zm
Convert Parsec (pc) to Zettameter (Zm) using the exact conversion factor (1 parsec = 0.0000308568 zettameter). See the formula, worked examples, conversion table, history, and common uses.
Parsecs to Zettameters 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.
Zettameter is 1e+21 meter units.
Result = input x 3.08567758e+16 / 1e+21.
Length uses the meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Parsecs to Zettameters
Parsec and Zettameter both measure length. Parsec is most often used for measuring distances to nearby stars via parallax.
Formula
zettameters = parsecs × 0.0000308567758149
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 zettameter equals 1e+21 base units, so dividing one by the other gives the direct parsec-to-zettameter factor of 0.0000308567758149.
Simple example
1 pc × 0.00003085677581 = 0.0000308568 Zm
1 parsec = 0.0000308568 zettameters.
Real-world example
10 pc × 0.00003085677581 = 0.0003085678 Zm
10 parsecs = 0.0003085678 zettameters.
Conversion table
| Parsec (pc) | Zettameter (Zm) |
|---|---|
| 1 pc | 0.0000308568 Zm |
| 5 pc | 0.0001542839 Zm |
| 10 pc | 0.0003085678 Zm |
| 21.0975 pc | 0.0006510008 Zm |
| 42.195 pc | 0.0013020017 Zm |
| 100 pc | 0.0030856776 Zm |
Reverse conversion: Zettameter to Parsec
0.0000308568 Zm × 32407.79289 = 1.000000784 pc
0.0000308568 zettameters = 1.000000784 parsecs.
parsecs = zettameters × 32407.7928944
For a page dedicated to this direction, see Zettameter 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 Zettameter (Zm)
Zettameter is 1e+21 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 zettameters are in 1 parsec?
1 parsec equals 0.0000308568 zettameters, using the exact defined conversion factor rather than an estimate.
How do I convert parsec to zettameter?
Multiply the parsec value by 0.00003085677581. The converter above does this instantly to whatever precision you set.
How do I convert zettameter back to parsec?
Use the reverse factor: 1 zettameter equals 32,407.79289 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 zettameter?
Zettameter (Zm) is a unit of length.
Is the parsec to zettameter conversion exact?
Yes. Both parsec and zettameter are defined by fixed standards rather than physical artifacts, so the factor of 0.00003085677581 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