astronomy
The parsec is a popular measure because it is an easy measurement to make. One only has to make visual sighting or photographic measurements and determine angel of parallax.
For a complete discussion on the definition of parsec see link.
1 kilo parsec
You don't need something as complicated as a "formula" - just use the conversion factor. 1 parsec = 3.09 x 1016 meters.
1 Parsec = 3.08568025 × 1016 meters.
1 Parsec = 3.08568025 × 1013 kilometers.
1 parsec = 19,173,510,995,000 miles.
1 Parsec = 3.26163626 light years
1 Parsec = 3.26163626 light years
Parsec - video game - was created in 1982.
Parsec - video game - happened in 1982.
1 parsec is 3.09 x 1016 meters.
It's the other way around - how many light yearsmake up a parsec? The answer is: 3.26 light years make up one parsec.
The astronomical unit called a parsec is based on the idea of parallax.