The Light Year Conversion helps you convert distances expressed in light years into more familiar units like kilometers, miles, astronomical units (AU), Earth radii, and more. A light year is the distance light travels in one year — approximately 5.88 trillion miles or 9.46 trillion kilometers. It’s a useful unit for describing astronomical distances, such as the distance between stars and galaxies.
This tool is especially useful for students, researchers, astronomers, and science enthusiasts who need quick, accurate conversions without needing to memorize astronomical constants.
With a single input — the number of light years — this tool provides real-time conversions across multiple unit systems:
- Metric: kilometers, meters, and decimeters.
- Imperial/US: miles, feet, inches, yards, and kilofeet.
- Astronomical: Earth radii (R🜨), Sun radii (R☉), astronomical units (AU), mega light years (Mly), and mega parsecs (Mpc).
All units are available in simple dropdowns that let you select your preferred output. Once selected, the calculator multiplies your light year value by a pre-set constant for that unit — no need for manual formulas or external tools.
Whether you're trying to grasp how far Proxima Centauri is or convert a cosmic scale for your physics project, this tool gives you the results instantly. Plus, it's designed to mimic the simplicity of our other NGDrives conversion tools — clean interface, mobile-friendly layout, and instant feedback as you type.
If you're curious about the science behind the numbers, be sure to also check out our Speed of Light Calculator and Light Year Calculator to dive deeper.