Light Years to Kilometers (ly to km)
Free online light year to kilometer 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 light year value by 9.46073e+12 — i.e. km = ly × 9.46073e+12
Quick check: 1 ly = 9.46073e+12 km
Quick check: 1 ly = 9.46073e+12 km
Light Years to Kilometers conversion table
| Light Years (ly) | Kilometers (km) |
|---|---|
| 1 ly | 9.46073e+12 km |
| 2 ly | 1.89215e+13 km |
| 3 ly | 2.83822e+13 km |
| 4 ly | 3.78429e+13 km |
| 5 ly | 4.73037e+13 km |
| 6 ly | 5.67644e+13 km |
| 7 ly | 6.62251e+13 km |
| 8 ly | 7.56858e+13 km |
| 9 ly | 8.51466e+13 km |
| 10 ly | 9.46073e+13 km |
| 15 ly | 1.41911e+14 km |
| 20 ly | 1.89215e+14 km |
| 25 ly | 2.36518e+14 km |
| 30 ly | 2.83822e+14 km |
| 40 ly | 3.78429e+14 km |
| 50 ly | 4.73037e+14 km |
| 75 ly | 7.09555e+14 km |
| 100 ly | 9.46073e+14 km |
| 250 ly | 2.36518e+15 km |
| 500 ly | 4.73037e+15 km |
| 1,000 ly | 9.46073e+15 km |
How to convert light years to kilometers
To convert light years to kilometers, multiply the amount in light years by 9.46073e+12. For example, 10 ly = 9.46073e+13 km. 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 kilometers are in one light year?
One light year is exactly 9.46073e+12 kilometers.
How do I convert ly to km?
Multiply the ly value by 9.46073e+12 to get km. The converter at the top of this page does this automatically and works in both directions.
How much is 100 light years in kilometers?
100 light years equals 9.46073e+14 kilometers.