Astronomical Unit to Light Year Converter
Enter a value in astronomical unit and get the equivalent in light year instantly. The calculator uses the standard unit relationship and runs directly in your browser.
Astronomical Unit → Light Year
Formula
This conversion page is dedicated to the astronomical unit-to-light year direction so the unit relationship, reverse path and examples are easy to find. For scale-factor units, XpressCalculator converts through the domain base unit using internationally recognized unit definitions. Temperature scales use their standard offset-and-scale equations rather than a simple multiplier.
Worked example
Starting with 1 astronomical unit (AU), the converter returns 0.0000158125 light year (ly). For any other value, enter the number above and the browser recalculates the result immediately.
Quick conversion table
| Astronomical Unit | Light Year |
|---|---|
| 1 AU | 0.0000158125 ly |
| 5 AU | 0.0000790625 ly |
| 10 AU | 0.0001581251 ly |
| 25 AU | 0.0003953127 ly |
| 50 AU | 0.0007906254 ly |
| 100 AU | 0.0015812507 ly |
Helpful guide
Unit conversions are most reliable when the source value and unit are identified correctly. Do not confuse similarly named US customary and imperial units, and keep significant figures appropriate to the precision of the original measurement. For engineering, scientific, medical or safety-critical work, confirm the measurement standard required by your application.
Use sensible precision and verify critical decisions with an authoritative source or qualified professional.
Frequently asked questions
How do I convert astronomical unit to light year?
Multiply the astronomical unit value by 0.0000158125 to get light year. This page performs the conversion instantly and shows the relationship clearly.
Is this astronomical unit to light year conversion exact?
The mathematical unit factor is applied directly. Displayed results may be rounded for readability, so retain more digits when high precision matters.
Can I reverse the conversion?
Yes. Use the linked light year to astronomical unit converter to reverse the direction without re-entering the formula manually.