Direct conversion
Convert light year [ly] to astronomical unit [AU] instantly with formula, examples, chart, and FAQs.
1 light year [ly] = 63241.077084 astronomical unit [AU]
1 light year [ly] = 63241.077084 astronomical unit [AU]
Example: 1 light year [ly] equals 63241.077084 astronomical unit [AU].
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: 2026-08-14.
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.
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.
| light year [ly] | astronomical unit [AU] |
|---|---|
| 1 | 63241.077084 |
| 2 | 126482.154169 |
| 5 | 316205.385421 |
| 10 | 632410.770843 |
| 20 | 1264821.541685 |
| 25 | 1581026.927107 |
| 50 | 3162053.854213 |
| 100 | 6324107.708427 |
| 1000 | 63241077.084266 |
Use this formula: 1 light year [ly] = 63241.077084 astronomical unit [AU] Enter your value in the calculator and the result updates instantly.
1 light year [ly] equals 63241.077084 astronomical unit [AU].
Yes. Use the swap button in the calculator or open the related reverse conversion link when it is listed on this page.