ConverterHub

Light-years to Parsecs Converter

Enter a value in light-years to convert it to parsecs, kilometres.

How to use

  1. Enter your values in the fields above.
  2. Press Calculate to see your result instantly.
  3. Use the Share button to copy a link to your result.

About this calculator

A parsec is defined geometrically, not by light-travel time: it's the distance at which 1 astronomical unit subtends an angle of exactly 1 arcsecond (its name literally comes from “parallax of one arcsecond”). Working out that geometry gives 1 parsec = 3.2616 light-years = 3.0857×10¹³ km.

Professional astronomers overwhelmingly use parsecs (and kiloparsecs, megaparsecs for galactic and cosmological distances) because it falls directly out of the parallax measurements used to determine stellar distances, while light-years remain the more intuitive unit in popular science writing — this converter bridges the two.

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