Light-years to Kilometres
Type a value in Light-years and get the result in Kilometres, calculated exactly.
30 Light-years = 283,821,914,177,424 Kilometres
Precision
Exact factorThis result is exact.
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Formula
km = ly × 9,460,730,472,580.8
To convert Light-years to Kilometres, multiply the value by 9,460,730,472,580.8.
Worked examples
- 1 ly × 9,460,730,472,580.8 = 9,460,730,472,580.8 km
- 30 ly × 9,460,730,472,580.8 = 283,821,914,177,424 km
- 100 ly × 9,460,730,472,580.8 = 946,073,047,258,080 km
This factor is exact by definition.
Conversion table
| Light-years (ly) | Kilometres (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 |
| 60 | 567,643,828,354,848 |
| 70 | 662,251,133,080,656 |
| 75 | 709,554,785,443,560 |
| 80 | 756,858,437,806,464 |
| 90 | 851,465,742,532,272 |
| 100 | 946,073,047,258,080 |
Values marked ≈ are rounded; the rest are exact.
Reverse table: Kilometres to Light-years
| Kilometres (km) | Light-years (ly) |
|---|---|
| 1 | ≈ 1.057000834 × 10⁻¹³ |
| 2 | ≈ 2.114001668 × 10⁻¹³ |
| 3 | ≈ 3.171002502 × 10⁻¹³ |
| 4 | ≈ 4.228003336 × 10⁻¹³ |
| 5 | ≈ 5.28500417 × 10⁻¹³ |
| 6 | ≈ 6.342005004 × 10⁻¹³ |
| 7 | ≈ 7.399005838 × 10⁻¹³ |
| 8 | ≈ 8.456006672 × 10⁻¹³ |
| 9 | ≈ 9.513007506 × 10⁻¹³ |
| 10 | ≈ 1.057000834 × 10⁻¹² |
| 15 | ≈ 1.585501251 × 10⁻¹² |
| 20 | ≈ 2.114001668 × 10⁻¹² |
| 25 | ≈ 2.642502085 × 10⁻¹² |
| 30 | ≈ 3.171002502 × 10⁻¹² |
| 40 | ≈ 4.228003336 × 10⁻¹² |
| 50 | ≈ 5.28500417 × 10⁻¹² |
| 60 | ≈ 6.342005004 × 10⁻¹² |
| 70 | ≈ 7.399005838 × 10⁻¹² |
| 75 | ≈ 7.927506255 × 10⁻¹² |
| 80 | ≈ 8.456006672 × 10⁻¹² |
| 90 | ≈ 9.513007506 × 10⁻¹² |
| 100 | ≈ 1.057000834 × 10⁻¹¹ |
Unit definitions
- Light-years ly
- The distance light travels in a Julian year: exactly 9 460 730 472 580 800 metres.
- Kilometres km
- Exactly 1000 metres.
Questions people ask
Light-years to Kilometres: what is the conversion factor?
One ly is 9,460,730,472,580.8 km.
How do I convert Light-years to Kilometres?
Use the formula above. For example, 30 ly = 283,821,914,177,424 km.
Is the conversion exact?
Yes. Both units have exact definitions, so the factor is exact; a result is only rounded when its decimals never end.
Factors checked 19 October 2026.