---
title: "Light-years to Kilometers — ly to km converter"
description: "1 light-year = 9,460,730,500,000 kilometers. Convert light-years to kilometers with a full conversion table, the exact formula, and a calculator for any value."
url: https://atoneplace.net/convert/light-years-to-km/
site: "At One Place"
---

# Light-years to kilometers

**1 light-year in kilometers: 1 ly = 9,460,730,500,000 km**

km = ly × 9,460,730,473,000

To convert light-years to kilometers, multiply by 9,460,730,473,000. The table below gives the values people look up most often, and the converter works for any number.

## Light-years to kilometers table

*Common light-year values converted to kilometers.*

| Light-years | Kilometers |
| --- | --- |
| 1 ly | 9,460,730,500,000 |
| 2 ly | 18,921,461,000,000 |
| 3 ly | 28,382,191,000,000 |
| 4 ly | 37,842,922,000,000 |
| 5 ly | 47,303,652,000,000 |
| 10 ly | 94,607,305,000,000 |
| 15 ly | 141,910,960,000,000 |
| 20 ly | 189,214,610,000,000 |
| 25 ly | 236,518,260,000,000 |
| 30 ly | 283,821,910,000,000 |
| 40 ly | 378,429,220,000,000 |
| 50 ly | 473,036,520,000,000 |
| 75 ly | 709,554,790,000,000 |
| 100 ly | 946,073,050,000,000 |
| 250 ly | 2.3651826 × 10^15 |
| 500 ly | 4.7303652 × 10^15 |
| 1,000 ly | 9.4607305 × 10^15 |

## How the conversion works

The relationship is km = ly × 9,460,730,473,000. Both units measure length, so the conversion is a fixed factor that never changes.

## Common questions

### How many kilometers are in one light-year?

One light-year equals 9,460,730,500,000 kilometers. km = ly × 9,460,730,473,000.

### How do you convert light-years to kilometers?

Use km = ly × 9,460,730,473,000. So 10 ly is 94,607,305,000,000 km.

### How many light-years are in one kilometer?

One kilometer equals 1.057 × 10^-13 light-years, which is the reverse of the conversion above.

## Related pages

- [Kilometers to Light-years](https://atoneplace.net/convert/km-to-light-years/)
- [Light-years to Meters](https://atoneplace.net/convert/light-years-to-meters/)
- [Light-years to Centimeters](https://atoneplace.net/convert/light-years-to-cm/)
- [Light-years to Millimeters](https://atoneplace.net/convert/light-years-to-mm/)
- [Light-years to Miles](https://atoneplace.net/convert/light-years-to-miles/)
- [Light-years to Yards](https://atoneplace.net/convert/light-years-to-yards/)
- [Light-years to Feet](https://atoneplace.net/convert/light-years-to-feet/)
- [Light-years to Inches](https://atoneplace.net/convert/light-years-to-inches/)

## Sources

- Guide for the Use of the International System of Units (SP 811) — NIST (https://www.nist.gov/pml/special-publication-811) [Public domain (US Government)]
- The International System of Units (SI Brochure) — Bureau International des Poids et Mesures (https://www.bipm.org/en/publications/si-brochure)
- Calculated on this page — At One Place (/about/)