A parsec is about 3.26156 light-years.
Parsecs to Centimeters Converter — pc to cm
Convert Parsec (pc) to Centimeter (cm) using the exact conversion factor (1 parsec = 3.085678e+18 centimeter). See the formula, worked examples, conversion table, unit comparison, history, and common uses.
Parsecs to Centimeters 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.
Centimeter is 0.01 meter units.
Result = input x 3.08567758e+16 / 0.01.
Length uses the meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Parsecs to Centimeters
Parsec and Centimeter both measure length. Parsec is typically associated with standard distance unit throughout professional astronomy worldwide, while Centimeter is typically associated with standard small-length unit worldwide except the US.
Formula
centimeters = parsecs × 3.085678e+18
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 centimeter equals 0.01 base units, so dividing one by the other gives the direct parsec-to-centimeter factor of 3.085678e+18.
Simple example
1 pc × 3.085678e+18 = 3.085678e+18 cm
1 parsec = 3.085678e+18 centimeters.
Real-world example
10 pc × 3.085678e+18 = 3.085678e+19 cm
10 parsecs = 3.085678e+19 centimeters.
Conversion table
| Parsec (pc) | Centimeter (cm) |
|---|---|
| 1 pc | 3.085678e+18 cm |
| 5 pc | 1.542839e+19 cm |
| 10 pc | 3.085678e+19 cm |
| 21.0975 pc | 6.510008e+19 cm |
| 42.195 pc | 1.302002e+20 cm |
| 100 pc | 3.085678e+20 cm |
Reverse conversion: Centimeter to Parsec
3.085678e+18 cm × 3.240779e-19 = 1.000000136 pc
3.085678e+18 centimeters = 1.000000136 parsecs.
parsecs = centimeters × 3.240779e-19
For a page dedicated to this direction, see Centimeter to Parsec.
Parsec vs. Centimeter
| Aspect | Parsec | Centimeter |
|---|---|---|
| Family | non-SI unit used in astronomy | SI derived (metric prefix) unit |
| Typical use | Measuring distances to nearby stars via parallax | Everyday small-object and body measurement (height, clothing sizes) outside the US |
| Where it's used | Standard distance unit throughout professional astronomy worldwide | Standard small-length unit worldwide except the US |
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 Centimeter
Centimeter (cm) measures distance. A centimeter is one-hundredth of a meter. It is classified as a SI derived (metric prefix) unit.
Where it's used: Standard small-length unit worldwide except the US
Uses of the Centimeter today
- Everyday small-object and body measurement (height, clothing sizes) outside the US
- Construction and manufacturing tolerances internationally
History of the Centimeter
The centimeter follows directly from the meter via the 'centi-' SI prefix (10⁻²), introduced with the metric system in the 1790s.
Historical origin. Centimeter was not the invention of a single named person; it developed through the process described above.
Parsec — sources
- IAU (International Astronomical Union) — parsec definition — Standard astronomical definition of the parsec via stellar parallax.
Centimeter — sources
- BIPM SI Brochure — SI prefixes — Defines 'centi-' as the prefix for 10⁻².
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many centimeters are in 1 parsec?
1 parsec equals 3.085678e+18 centimeters, using the exact defined conversion factor rather than an estimate.
How do I convert parsec to centimeter?
Multiply the parsec value by 3.085678e+18. The converter above does this instantly to whatever precision you set.
How do I convert centimeter back to parsec?
Use the reverse factor: 1 centimeter equals 3.240779e-19 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 centimeter?
Centimeter (cm) measures distance. A centimeter is one-hundredth of a meter. It is classified as a SI derived (metric prefix) unit.
Is the parsec to centimeter conversion exact?
Yes. Both parsec and centimeter are defined by fixed standards rather than physical artifacts, so the factor of 3.085678e+18 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