Convert light years to kilometers
1 ly = 9,460,730,472,580.8 km. Change the amount below, or read the formula and the reference table further down.
1 light year equals
kilometers
1 ly = 9,460,730,472,580.8 km
The formula
Light years and kilometers both measure length from the same zero, so a single multiplier does the job.
km = ly × 9,460,730,472,580.8
Going the other way? Convert kilometers to light years.
Light years to kilometers table
Common values, rounded for reading.
| Light years (ly) | Kilometers (km) |
|---|---|
| 1 | 9,460,730,472,580.8 |
| 2 | 18,921,460,945,161.6 |
| 3 | 28,382,191,417,742.4 |
| 4 | 37,842,921,890,323.2 |
| 5 | 47,303,652,362,904 |
| 6 | 56,764,382,835,484.8 |
| 7 | 66,225,113,308,065.6 |
| 8 | 75,685,843,780,646.4 |
| 9 | 85,146,574,253,227.2 |
| 10 | 94,607,304,725,808 |
| 15 | 141,910,957,088,712 |
| 20 | 189,214,609,451,616 |
| 25 | 236,518,261,814,520 |
| 30 | 283,821,914,177,424 |
| 40 | 378,429,218,903,232 |
| 50 | 473,036,523,629,040 |
| 75 | 709,554,785,443,559.9 |
| 100 | 946,073,047,258,080 |
| 250 | 2.3652 × 10^15 |
| 500 | 4.7304 × 10^15 |
| 1,000 | 9.4607 × 10^15 |
Questions people ask
- How many kilometers are in a light year?
- One light year equals 9,460,730,472,580.8 kilometers.
- How do I convert light years to kilometers by hand?
- Multiply the number of light years by 9,460,730,472,580.8. For a rough check, 9,460,730,472,580.8 is close enough for most everyday use.
- What is 1 light year in kilometers?
- 1 light year is 9,460,730,472,580.8 kilometers.
Calcuit generates this page from a unit table, so the factors here match every other page on the site.