Kilometers (km) to Light-years (ly) Conversion
Kilometers
The kilometre, equal to exactly 1,000 metres, is the standard unit for measuring distances at a geographic and infrastructural scale, including road distances, flight paths, and the dimensions of countries and continents. It is derived directly from the metre by applying the SI prefix kilo- (from Greek khilioi, meaning thousand) and is universally used in science, meteorology, and everyday life in all countries that have adopted the metric system. The Earth's circumference at the equator is approximately 40,075 km, a value historically used in the original derivation of the metre itself.
Light-years
The light-year is a unit of astronomical distance equal to the distance that light travels in a vacuum in one Julian year (365.25 days), approximately 9.461 × 10¹⁵ metres. Despite containing the word "year," it is strictly a unit of distance, not time. The nearest star system, Alpha Centauri, is approximately 4.37 light-years away, while the observable universe extends approximately 46 billion light-years in every direction.
| Kilometers (km) | Light-years (ly) |
|---|---|
| 0.1 km | 0.0000000000000106 ly |
| 1 km | 0.000000000000106 ly |
| 2 km | 0.000000000000211 ly |
| 3 km | 0.000000000000317 ly |
| 5 km | 0.000000000000529 ly |
| 10 km | 0.00000000000106 ly |
| 20 km | 0.00000000000211 ly |
| 30 km | 0.00000000000317 ly |
| 50 km | 0.00000000000529 ly |
| 100 km | 0.0000000000106 ly |
| 1000 km | 0.000000000106 ly |
Frequently Asked Questions (FAQ)
How many light-years are in 1 kilometers?
1 kilometers (km) is exactly 0 light-years (ly).
How do I convert kilometers to light-years?
Multiply the value in kilometers by 0 to get the result in light-years. Or use the converter above — type any number and see the result instantly.