Direct conversion
Convert astronomical unit [AU] to light year [ly] instantly with formula, examples, chart, and FAQs.
1 astronomical unit [AU] = 0.000016 light year [ly]
1 astronomical unit [AU] = 0.000016 light year [ly]
Example: 1 astronomical unit [AU] equals 0.000016 light year [ly].
Length conversions use the metre as the reference unit. Common imperial relationships are exact where standardized, such as 1 inch = 0.0254 metre and 1 foot = 0.3048 metre.
Displayed results are rounded for readability. The calculator keeps enough precision for everyday use and switches to scientific notation for very large or very small values. Last reviewed: 2026-05-21.
The astronomical unit (AU) is a length unit used to express measurements in this converter.
HistoryThis unit is included because it appears in practical measurement systems, technical references, product specifications, or everyday conversion needs.
Current useUse astronomical unit when comparing length values, checking specifications, converting between systems, or preparing quick estimates.
The light year (ly) is a length unit used to express measurements in this converter.
HistoryThis unit is included because it appears in practical measurement systems, technical references, product specifications, or everyday conversion needs.
Current useUse light year when comparing length values, checking specifications, converting between systems, or preparing quick estimates.
| astronomical unit [AU] | light year [ly] |
|---|---|
| 1 | 0.000016 |
| 2 | 0.000032 |
| 5 | 0.000079 |
| 10 | 0.000158 |
| 20 | 0.000316 |
| 25 | 0.000395 |
| 50 | 0.000791 |
| 100 | 0.001581 |
| 1000 | 0.015813 |
Use this formula: 1 astronomical unit [AU] = 0.000016 light year [ly] Enter your value in the calculator and the result updates instantly.
1 astronomical unit [AU] equals 0.000016 light year [ly].
Yes. Use the swap button in the calculator or open the related reverse conversion link when it is listed on this page.