Astronomical Distance Converter
This converter translates cosmic distances between light years, parsecs, astronomical units (AU), lunar distances, kilometres and miles — useful for students, amateur astronomers and anyone reading space news that mixes these units.
Result will appear here.
How to use
- Enter a distance value and pick the From unit (for example, light years).
- Choose the From and To units — the result updates live.
- See the converted values in all units below.
Note: 1 light year is the distance light travels in one year.
Tips
- Use the Swap button to reverse the conversion instantly without retyping the value.
- The list below the result shows the same distance in every unit — handy for comparing cosmic scales at a glance.
- Very large answers appear in scientific notation (for example 9.46e+12). As a sanity check, 1 parsec equals about 3.26 light years.
Frequently Asked Questions (FAQ)
Which units does it convert?
Light years, parsecs, astronomical units (AU) and kilometres.
Can I convert in both directions?
Yes. Enter a value, pick the from and to units, or use the swap button to reverse them.
How many kilometres are in a light year?
One light year is about 9.461 trillion kilometres, the distance light travels in one year.
Who uses this converter?
Students learning about space, and anyone comparing cosmic distances such as how far away a star is.