Light Year Conversion Calculator

Convert light years to kilometers, miles and AU.

Kilometers 9,460,730,472.6

Miles 3,652,817,552.54

Astronomical units (AU) 63,241.08

Formula: 1 ly = 9.4607 × 10¹² km

Step-by-step with your numbers:

1. Values used:

2. Light years = 1 ly

4. Kilometers = 9,460,730,472.6

5. Miles = 3,652,817,552.54

6. Astronomical units = 63,241.08AU

Did we solve your problem today?

A light year is the distance light travels in one year.

The math behind it

1 light year ≈ 9.46 trillion km ≈ 5.88 trillion miles ≈ 63,241 AU.

1 ly ≈ 9.46 × 10¹² km.

Time or distance?

Distance — despite the name, it's how far light goes in a year.