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Convert Astronomical Unit to Light-year

1 astronomical unit = 0.000015812507 light-years (AU to ly).

A astronomical unit is smaller than a light-year — it takes 63,241.1 of them to make a single light-year. Both units describe length, and the reverse is just as easy — one light-year equals 63,241.1 astronomical units. The converter above does this in real time, and the reference chart lists the values that come up most often.

0.000015812507

1 AU = 0.000015812507 ly

How to convert Astronomical Units to Light-years

Multiply the astronomical unit value by 0.0000158125 to get light-years.

Example: 10 astronomical units = 0.000158125 light-years.

Astronomical Unit to Light-year Conversion Chart

Astronomical UnitsLight-years
1 AU0.000015812507 ly
2 AU0.000031625015 ly
3 AU0.000047437522 ly
5 AU0.000079062537 ly
10 AU0.00015812507 ly
20 AU0.00031625015 ly
25 AU0.00039531269 ly
50 AU0.00079062537 ly
100 AU0.0015812507 ly
1000 AU0.015812507 ly

Frequently Asked Questions

How many light-years are in a astronomical unit?
There are 0.000015812507 light-years in 1 astronomical unit.
How do you convert astronomical units to light-years?
Multiply the astronomical unit value by 0.0000158125 to get light-years.
What is 5 astronomical units in light-years?
5 astronomical units equals 0.000079062537 light-years.
What is 100 astronomical units in light-years?
100 astronomical units equals 0.0015812507 light-years.
What is 1 light-year in astronomical units?
1 light-year equals 63,241.077 astronomical units.
Is this astronomical unit to light-year converter free?
Yes. The converter is free, needs no sign-up, and runs entirely in your browser — the values you enter never leave your device.

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