Kilometers to Light-years
1 km ≈ 1.057 × 10⁻¹³ ly. Edit either value to convert instantly.
Conversion formula
ly = km × (1,000) × (1 / 9.4607304725808 × 10¹⁵)1 km ≈ 1.057 × 10⁻¹³ ly
kilometer (km)
One kilometer equals exactly 1,000 m.
Source: BIPM SI Brochure, 9th edition — SI prefixes and accepted non-SI units
light-year (ly)
A light-year is 9.4607304725808 × 10¹⁵ m: the distance light travels in vacuum in one Julian year of exactly 365.25 days.
Source: International Astronomical Union — Measuring the Universe
Conversion table
| km | ly |
|---|---|
| ≈ 1.057 × 10⁻¹³ | |
| ≈ 2.114 × 10⁻¹³ | |
| ≈ 5.285 × 10⁻¹³ | |
| ≈ 1.057 × 10⁻¹² | |
| ≈ 1.5855 × 10⁻¹² | |
| ≈ 2.114 × 10⁻¹² | |
| ≈ 2.6425 × 10⁻¹² | |
| ≈ 3.171 × 10⁻¹² | |
| ≈ 4.228 × 10⁻¹² | |
| ≈ 4.7565 × 10⁻¹² |
| km | ly |
|---|---|
| ≈ 5.285 × 10⁻¹² | |
| ≈ 6.34201 × 10⁻¹² | |
| ≈ 7.39901 × 10⁻¹² | |
| ≈ 8.45601 × 10⁻¹² | |
| ≈ 9.51301 × 10⁻¹² | |
| ≈ 1.057 × 10⁻¹¹ | |
| ≈ 1.5855 × 10⁻¹¹ | |
| ≈ 1.6912 × 10⁻¹¹ | |
| ≈ 1.7969 × 10⁻¹¹ | |
| ≈ 1.9026 × 10⁻¹¹ |
Frequently asked questions
How many light-years are in 1 kilometer?
1 km ≈ 1.057 × 10⁻¹³ ly. ly = km × (1,000) × (1 / 9.4607304725808 × 10¹⁵)
How do I convert km to ly?
ly = km × (1,000) × (1 / 9.4607304725808 × 10¹⁵)
Is 1 kilometer bigger than 1 light-year?
1 km ≈ 1.057 × 10⁻¹³ ly.
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