Parsec to Span Converter
Convert Parsec (pc) to Span (span) instantly. 1 pc = 1.349815e+17 span.
Length Converter
31 units available
1 pc = 1.349815e+17 span
Formula:
span = pc × 1.349815e+17With your value: 1 pc = 1.349815e+17 span
How big is that?
Everyday references on a logarithmic scale, all expressed in parsec so you can sanity-check the result.
Other Parsec to Span conversions
Parsec to Span Conversion Table
| Parsec (pc) | Span (span) |
|---|---|
| 0.5 | 6.749076e+16 |
| 1 | 1.349815e+17 |
| 2 | 2.699630e+17 |
| 5 | 6.749076e+17 |
| 10 | 1.349815e+18 |
| 15 | 2.024723e+18 |
| 20 | 2.699630e+18 |
| 25 | 3.374538e+18 |
| 50 | 6.749076e+18 |
| 100 | 1.349815e+19 |
| 250 | 3.374538e+19 |
| 500 | 6.749076e+19 |
| 1000 | 1.349815e+20 |
Span to Parsec Conversion Table
| Span (span) | Parsec (pc) |
|---|---|
| 0.5 | 3.704211e-18 |
| 1 | 7.408421e-18 |
| 2 | 1.481684e-17 |
| 5 | 3.704211e-17 |
| 10 | 7.408421e-17 |
| 15 | 1.111263e-16 |
| 20 | 1.481684e-16 |
| 25 | 1.852105e-16 |
| 50 | 3.704211e-16 |
| 100 | 7.408421e-16 |
| 250 | 1.852105e-15 |
| 500 | 3.704211e-15 |
| 1000 | 7.408421e-15 |
Where these values come from
Every factor on this page is traced to the document that defines it. See the full provenance dataset or our methodology.
Parsec (pc)
Length
One parsec is 648 000/π astronomical units ≈ 3.085 677 581 × 10¹⁶ m.
Source: IAU Resolution B2 (2012) — definition of the astronomical unit; IAU B2 (2015) nominal values
International Astronomical Union · Reviewed 2026-07-01
Span (span)
Length
Traceable to the metre, defined by fixing the speed of light in vacuum at 299 792 458 m/s. Imperial lengths derive from the 1959 international yard (0.9144 m exactly).
Source: BIPM, The International System of Units (SI), 9th edition, 2019 (updated 2024)
Bureau International des Poids et Mesures · Reviewed 2026-07-01
How to Convert Parsec to Span
To convert from Parsec (pc) to Span (span), multiply the value by 1.349815e+17.
Formula: span = pc × 1.349815e+17
Reverse: pc = span × 7.408421e-18
Step-by-Step Example
- Start with your value in Parsec. For example: 5 pc
- Multiply by the conversion factor: 5 x 1.349815e+17
- The result is: 6.749076e+17 span
About Parsec
The parsec is the distance at which one astronomical unit subtends an angle of one arcsecond, about 3.26 light years. Professional astronomers prefer it to the light year.
Common uses: astrophysics, star catalogues, cosmology.
About Span
The span (span) is a unit of distance and length. One span equals 0.2286 metres. UnitConvertLab converts it against every other length unit using this exact definition, so results are reproducible to full double precision rather than rounded lookup tables.
Common uses: length calculations, engineering and science, education.
Frequently Asked Questions
How many Span are in 1 Parsec?
There are exactly 1.349815e+17 Span in 1 Parsec. This means the conversion factor from Parsec to Span is 1.349815e+17.
What is the formula to convert Parsec to Span?
The formula to convert Parsec to Span is: span = pc × 1.349815e+17. For example, to convert 10 Parsec to Span, you would multiply 10 by 1.349815e+17.
What is a Parsec?
The parsec is the distance at which one astronomical unit subtends an angle of one arcsecond, about 3.26 light years. Professional astronomers prefer it to the light year.
What is a Span?
The span (span) is a unit of distance and length. One span equals 0.2286 metres. UnitConvertLab converts it against every other length unit using this exact definition, so results are reproducible to full double precision rather than rounded lookup tables.
What are the common uses of Parsec?
The Parsec is commonly used in astrophysics, star catalogues, cosmology.
Related Length Conversions
Cite this page
UnitConvertLab. (2026). Parsec to Span converter. UnitConvertLab. Retrieved from https://unitconvertlab.com/convert/parsec-to-span