Free Light-Year to Kilometres Converter

Convert astronomical distances between light-years and kilometres. One light-year is the distance light travels in one Julian year.

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Kilometres

9,460,730,472,581 km

Astronomical Units63,241.08 AU
Parsecs0.306602 pc

Kilometres vs Distance

View formula & how it works →

Light-Year Conversion

A light-year is the distance light travels in one Julian year (365.25 days).

1 ly = 9 460 730 472 580.8 km

From: c × t = 299 792.458 km/s × 31 557 600 s

Example Calculation

Proxima Centauri is about 4.246 ly away.

  1. 01km = 4.246 × 9 460 730 472 580.8
  2. 02≈ 4.017 × 10¹³ km
  3. 03AU = 4.246 × 63241 ≈ 268 521 AU
  4. 04pc = 4.246 / 3.2616 ≈ 1.302 pc

Frequently Asked Questions

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