Parsecs (pc)	Light-Years (ly)
1 pc	3.2616 ly
2 pc	6.5231 ly
5 pc	16.3078 ly
10 pc	32.6156 ly
25 pc	81.5391 ly
50 pc	163.0782 ly
100 pc	326.1564 ly
250 pc	815.3909 ly
500 pc	1630.78 ly
1000 pc	3261.56 ly

Convert Parsecs to Light-Years

Convert parsecs to light-years (pc to ly) with our instant calculator. 1 pc = 3.261564 ly. Includes exact formula and reference tables.

How to Convert Parsecs to Light-Years (pc to ly)

1 Parsec (pc) is equal to 3.261564 Light-Years (ly). Multiply the parsec value by 3.261563777

Quick Answer 1 pc = 3.261564 ly

Formula ly = pc × 3.261563777

Inverse Factor 1 ly = 0.306601 pc

Unit Definitions & Metrology Context

The standard SI base unit of length is the meter (m), defined as the distance traveled by light in a vacuum in 1/299,792,458 of a second.

About Parsecs (pc): Parsec (pc) is a unit in the Length & Distance measurement category. It is widely used in astrophysics (~3.26 light-years). Relative to the length & distance base unit, 1 pc equals 30856775814913672 Meters (m).

About Light-Years (ly): Light-Year (ly) is a unit in the Length & Distance measurement category. It is widely used in interstellar astronomical distance. Relative to the length & distance base unit, 1 ly equals 9460730472580800 Meters (m).

Need to convert in the opposite direction? Visit our Convert Light-Years to Parsecs (ly to pc) calculator (1 ly = 0.306601 pc).

Step-by-Step Worked Examples (pc to ly)

Convert 5 Parsecs to Light-Years: Applying the formula (ly = pc × 3.261563777): starting with 5 pc, multiply the parsec value by 3.261563777 to get 16.3078 ly.
Convert 10 Parsecs to Light-Years: Applying the formula (ly = pc × 3.261563777): starting with 10 pc, multiply the parsec value by 3.261563777 to get 32.6156 ly.
Convert 50 Parsecs to Light-Years: Applying the formula (ly = pc × 3.261563777): starting with 50 pc, multiply the parsec value by 3.261563777 to get 163.0782 ly.

Popular Length & Distance Conversions

Kilometer ⇄ Mile

Multiply kilometers by ~0.621371 to get miles, or divide miles by 0.621371 to get kilometers.

Inch ⇄ Centimeter

1 inch is legally and scientifically defined as exactly 2.54 centimeters.

Foot ⇄ Meter

1 foot is defined as exactly 0.3048 meters (12 inches).

Mile ⇄ Nautical Mile

1 nautical mile is exactly 1,852 meters (~1.15078 statute miles).

Frequently Asked Questions

Verified answers and formulas for converting parsecs to light-years.

How many light-years are in 1 parsec?

There are 3.261564 light-years (ly) in 1 parsec (pc). Conversely, 1 light-year equals 0.306601 parsecs.

How do you convert parsecs to light-years?

To convert parsecs (pc) to light-years (ly), use the formula: ly = pc × 3.261563777. Multiply the parsec value by 3.261563777. For example, 10 pc equals 32.6156 ly.

How do I convert back from light-years to parsecs?

To convert in the reverse direction from light-years (ly) to parsecs (pc), use the inverse formula: pc = ly × 0.3066013938. Multiply the light-year value by 0.3066013938 (1 ly = 0.306601 pc).

What is the difference between parsec (pc) and light-year (ly)?

Both parsec and light-year measure length & distance. Parsec (pc) is a unit in the Length & Distance measurement category. It is widely used in astrophysics (~3.26 light-years). Relative to the length & distance base unit, 1 pc equals 30856775814913672 Meters (m). Light-Year (ly) is a unit in the Length & Distance measurement category. It is widely used in interstellar astronomical distance. Relative to the length & distance base unit, 1 ly equals 9460730472580800 Meters (m).

How many miles are in a kilometer?

There are approximately 0.621371 miles in 1 kilometer. To convert kilometers to miles quickly in your head, multiply by 6 and divide by 10 (or multiply by 0.6).