Kilometers to Light Years (km to ly)
Free online kilometer to light year converter. Type a value, get an instant exact result — plus the formula, a ready-made conversion table, and reverse conversion.
LENGTH CONVERTER — INSTANT RESULT
Formula: multiply the kilometer value by 1.057e-13 — i.e. ly = km × 1.057e-13
Quick check: 1 km = 1.057e-13 ly
Quick check: 1 km = 1.057e-13 ly
Kilometers to Light Years conversion table
| Kilometers (km) | Light Years (ly) |
|---|---|
| 1 km | 1.057e-13 ly |
| 2 km | 2.114e-13 ly |
| 3 km | 3.171e-13 ly |
| 4 km | 4.228e-13 ly |
| 5 km | 5.285e-13 ly |
| 6 km | 6.34201e-13 ly |
| 7 km | 7.39901e-13 ly |
| 8 km | 8.45601e-13 ly |
| 9 km | 9.51301e-13 ly |
| 10 km | 1.057e-12 ly |
| 15 km | 1.5855e-12 ly |
| 20 km | 2.114e-12 ly |
| 25 km | 2.6425e-12 ly |
| 30 km | 3.171e-12 ly |
| 40 km | 4.228e-12 ly |
| 50 km | 5.285e-12 ly |
| 75 km | 7.92751e-12 ly |
| 100 km | 1.057e-11 ly |
| 250 km | 2.6425e-11 ly |
| 500 km | 5.285e-11 ly |
| 1,000 km | 1.057e-10 ly |
How to convert kilometers to light years
To convert kilometers to light years, multiply the amount in kilometers by 1.057e-13. For example, 10 km = 1.057e-12 ly. To convert in the other direction, divide by the same factor, or use the ⇄ swap button above.
Convert between metric and imperial/US customary length units, plus nautical, astronomical and survey units. The meter is the SI base unit of length; all factors below are exact definitions where a legal definition exists.
Frequently asked questions
How many light years are in one kilometer?
One kilometer is exactly 1.057e-13 light years.
How do I convert km to ly?
Multiply the km value by 1.057e-13 to get ly. The converter at the top of this page does this automatically and works in both directions.
How much is 100 kilometers in light years?
100 kilometers equals 1.057e-11 light years.