Convert

Light-year to Parsec

Exact answer: 1 Lj = 0.306601393786 pc (IAU definition, exact)

Light-year and Parsec are astronomical lengths. Both are defined by exact constants, not by measurements. Length figures range from nanometres in semiconductor manufacturing to astronomical distances, and inch, foot and mile come from a different system of units.

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UnitCloud is a local measurement lab for everyday work, engineering, IT, energy, mobility and design. Every conversion shows result, formula, base unit, rounding and the common mistake.

What do you want to convert?

From1 Lj

Result0.306601 pc

Factor1 Lj = 0.306601393786 pc

Source basisBIPM SI Brochure · NIST Guide to SI Appendix B

Examples

011 Lj = 0.306601 pc

Example value from the reference table. Internal calculation uses stored factors; display output is rounded.

02Common mistake

Inch, foot and mile use fixed factors. Errors usually come from early rounding or from mixing land miles and nautical miles.

03Base unit: m

1 Lj = 9460730472580800.0 m. Then the value is converted through the base unit m into Parsec.

Table

Light-year to Parsec
Light-year	Parsec
1	0.306601
10	3.066014
100	30.660139
1,000	306.601394
10,000	3,066.013938
100,000	30,660.139379

Formula

1 Lj = 9460730472580800.0 m. Then the value is converted through the base unit m into Parsec.

Sources

BIPM SI BrochureSI base units, prefixes and official SI context.NIST Guide to SI Appendix BNIST conversion-factor method and non-SI factors.

Related conversions

Light-year to KilometreLj → kmLength Kilometre to Light-yearkm → LjLength Parsec to Light-yearpc → LjLength Inch to Centimetrein → cmLength

Search and practice paths

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Factor origin

Factors come from the stored source family and are not derived from rounded display values.

Rounding rule

UnitCloud keeps calculating with stored factors and rounds only the displayed output by selected precision.

When not to use

Do not use as the sole basis for official, medical, safety-critical or contractual decisions.

Citation

Citation note: UnitCloud, conversion with formula, sources reviewed: September 2026. Length. Source basis: BIPM SI Brochure · NIST Guide to SI Appendix B.

Common questions

What is the factor for Light-year to Parsec?

1 Lj = 0.306601393786 pc

Which formula does Light-year to Parsec use?

1 Lj = 9.46073e15 m. Then the value is converted through the base unit m into Parsec.

What is the most common mistake?

Inch, foot and mile use fixed factors. Errors usually come from early rounding or from mixing land miles and nautical miles.

When should I verify the result?

Do not use as the sole basis for official, medical, safety-critical or contractual decisions.