Direct conversion
Convert light year [ly] to light second [light-s] instantly with formula, examples, chart, and FAQs.
1 light year [ly] = 31557600 light second [light-s]
1 light year [ly] = 31557600 light second [light-s]
Example: 1 light year [ly] equals 31557600 light second [light-s].
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 light second (light-s) 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 second when comparing length values, checking specifications, converting between systems, or preparing quick estimates.
| light year [ly] | light second [light-s] |
|---|---|
| 1 | 31557600 |
| 2 | 63115200 |
| 5 | 157788000 |
| 10 | 315576000 |
| 20 | 631152000 |
| 25 | 788940000 |
| 50 | 1577880000 |
| 100 | 3155760000 |
| 1000 | 31557600000 |
Use this formula: 1 light year [ly] = 31557600 light second [light-s] Enter your value in the calculator and the result updates instantly.
1 light year [ly] equals 31557600 light second [light-s].
Yes. Use the swap button in the calculator or open the related reverse conversion link when it is listed on this page.