Light Year Calculator
Convert light years to kilometres, miles, astronomical units and parsecs. A light year is a distance, not a duration — it is how far light travels in one Julian year.
Result9,460,730,472,580.8 km1 ly converted
1 ly equals9,460,730,472,580.8 km
1 km equals1.057e-13 ly
Light year to kilometer reference
| light year | kilometer |
|---|---|
| 1 ly | 9,460,730,472,580.8 km |
| 2 ly | 18,921,460,945,161.6 km |
| 5 ly | 47,303,652,362,904 km |
| 10 ly | 94,607,304,725,808 km |
| 25 ly | 236,518,261,814,520 km |
| 50 ly | 473,036,523,629,040 km |
| 100 ly | 946,073,047,258,080 km |
| 500 ly | 4.73037e+15 km |
| 1,000 ly | 9.46073e+15 km |
How to convert light year to kilometer
One light year equals 9.460730473e+12 km, so multiply the number of light years by 9.460730473e+12:
km = ly × 9.460730473e+12
Going the other way
One kilometer equals 1.057000834e-13 ly, so to convert back:
ly = km × 1.057000834e-13
Both directions are shown in the results above, and the drop-downs let you convert between any pair of length units — not just these two.