How to convert kilometers to light-years
To convert kilometers (km) to light-years (ly), multiply the value in kilometers by 1.057000834 × 10⁻¹³.
ly = km × 1.057000834 × 10⁻¹³
Example: 5 km = 5.28500417 × 10⁻¹³ ly.
You can also type 5 km to ly into the smart calculator, or mix units: 1 km + 1 ly.
Kilometers to Light-Years conversion table
| Kilometers | Light-Years |
|---|---|
| 0.01 km | 1.0570008 × 10⁻¹⁵ ly |
| 0.1 km | 1.0570008 × 10⁻¹⁴ ly |
| 0.25 km | 2.6425021 × 10⁻¹⁴ ly |
| 0.5 km | 5.2850042 × 10⁻¹⁴ ly |
| 1 km | 1.0570008 × 10⁻¹³ ly |
| 2 km | 2.1140017 × 10⁻¹³ ly |
| 3 km | 3.1710025 × 10⁻¹³ ly |
| 4 km | 4.2280033 × 10⁻¹³ ly |
| 5 km | 5.2850042 × 10⁻¹³ ly |
| 6 km | 6.342005 × 10⁻¹³ ly |
| 7 km | 7.3990058 × 10⁻¹³ ly |
| 8 km | 8.4560067 × 10⁻¹³ ly |
| 9 km | 9.5130075 × 10⁻¹³ ly |
| 10 km | 1.0570008 × 10⁻¹² ly |
| 12 km | 1.268401 × 10⁻¹² ly |
| 15 km | 1.5855013 × 10⁻¹² ly |
| 20 km | 2.1140017 × 10⁻¹² ly |
| 25 km | 2.6425021 × 10⁻¹² ly |
| 30 km | 3.1710025 × 10⁻¹² ly |
| 40 km | 4.2280033 × 10⁻¹² ly |
| 50 km | 5.2850042 × 10⁻¹² ly |
| 60 km | 6.342005 × 10⁻¹² ly |
| 75 km | 7.9275063 × 10⁻¹² ly |
| 100 km | 1.0570008 × 10⁻¹¹ ly |
| 250 km | 2.6425021 × 10⁻¹¹ ly |
| 500 km | 5.2850042 × 10⁻¹¹ ly |
| 1,000 km | 1.0570008 × 10⁻¹⁰ ly |
Converting light-years back to kilometers
1 ly = 9,460,730,473,000 km. See the Light-Years to Kilometers converter, or press the swap button above.
About the units
Kilometer (km)
One thousand meters. A mile is about 1.609 kilometers.
Light-year (ly)
The distance light travels in one Julian year: exactly 9,460,730,472,580,800 meters.
Length measures distance in one dimension. The SI base unit is the meter, defined by the distance light travels in a vacuum in 1/299,792,458 of a second. Since the 1959 international yard and pound agreement, imperial and US customary lengths are defined exactly in meters: an inch is exactly 2.54 centimeters.
Questions and answers
How many light-years are in a kilometer?
One kilometer (km) equals 1.057000834 × 10⁻¹³ light-years (ly).
How do I convert kilometers to light-years?
To convert kilometers to light-years, multiply the value in kilometers by 1.057000834 × 10⁻¹³. The formula is ly = km × 1.057000834 × 10⁻¹³. For example, 5 km = 5.2850042 × 10⁻¹³ ly.
What is 5 km in ly?
5 kilometers is 5.28500417 × 10⁻¹³ light-years.
Which is bigger, a kilometer or a light-year?
A light-year is bigger: 1 ly = 9,460,730,473,000 km.
How many centimeters are in a foot?
A foot is exactly 30.48 centimeters, because an inch is defined as exactly 2.54 cm and a foot is 12 inches.
Does this km to ly converter work offline?
Yes. ConvertEasy is a progressive web app: after your first visit it keeps working with no connection, and you can install it to your home screen from the browser menu.