Light-Years (ly)	Astronomical Units (AU)
1 ly	63241.08 AU
2 ly	126482.15 AU
5 ly	316205.39 AU
10 ly	632410.77 AU
25 ly	1581026.93 AU
50 ly	3162053.85 AU
100 ly	6324107.71 AU
250 ly	15810269.27 AU
500 ly	31620538.54 AU
1000 ly	63241077.08 AU

Convert Light-Years to Astronomical Units

Convert light-years to astronomical units (ly to AU) with our instant calculator. 1 ly = 63241.077084 AU. Includes exact formula and reference tables.

How to Convert Light-Years to Astronomical Units (ly to AU)

1 Light-Year (ly) is equal to 63241.077084 Astronomical Units (AU). Multiply the light-year value by 63241.07708

Quick Answer 1 ly = 63241.077084 AU

Formula AU = ly × 63241.07708

Inverse Factor 1 AU = 0.000016 ly

Unit Definitions & Metrology Context

The standard SI base unit of length is the meter (m), defined as the distance traveled by light in a vacuum in 1/299,792,458 of a second.

About Light-Years (ly): Light-Year (ly) is a unit in the Length & Distance measurement category. It is widely used in interstellar astronomical distance. Relative to the length & distance base unit, 1 ly equals 9460730472580800 Meters (m).

About Astronomical Units (AU): Astronomical Unit (AU) is a unit in the Length & Distance measurement category. It is widely used in earth-sun distance (solar system). Relative to the length & distance base unit, 1 AU equals 149597870700 Meters (m).

Need to convert in the opposite direction? Visit our Convert Astronomical Units to Light-Years (AU to ly) calculator (1 AU = 0.000016 ly).

Step-by-Step Worked Examples (ly to AU)

Convert 5 Light-Years to Astronomical Units: Applying the formula (AU = ly × 63241.07708): starting with 5 ly, multiply the light-year value by 63241.07708 to get 316205.3854 AU.
Convert 10 Light-Years to Astronomical Units: Applying the formula (AU = ly × 63241.07708): starting with 10 ly, multiply the light-year value by 63241.07708 to get 632410.7708 AU.
Convert 50 Light-Years to Astronomical Units: Applying the formula (AU = ly × 63241.07708): starting with 50 ly, multiply the light-year value by 63241.07708 to get 3162053.8542 AU.

Popular Length & Distance Conversions

Kilometer ⇄ Mile

Multiply kilometers by ~0.621371 to get miles, or divide miles by 0.621371 to get kilometers.

Inch ⇄ Centimeter

1 inch is legally and scientifically defined as exactly 2.54 centimeters.

Foot ⇄ Meter

1 foot is defined as exactly 0.3048 meters (12 inches).

Mile ⇄ Nautical Mile

1 nautical mile is exactly 1,852 meters (~1.15078 statute miles).

Frequently Asked Questions

Verified answers and formulas for converting light-years to astronomical units.

How many astronomical units are in 1 light-year?

There are 63241.077084 astronomical units (AU) in 1 light-year (ly). Conversely, 1 astronomical unit equals 0.000016 light-years.

How do you convert light-years to astronomical units?

To convert light-years (ly) to astronomical units (AU), use the formula: AU = ly × 63241.07708. Multiply the light-year value by 63241.07708. For example, 10 ly equals 632410.7708 AU.

How do I convert back from astronomical units to light-years?

To convert in the reverse direction from astronomical units (AU) to light-years (ly), use the inverse formula: ly = AU × 0.00001581250741. Multiply the astronomical unit value by 0.00001581250741 (1 AU = 0.000016 ly).

What is the difference between light-year (ly) and astronomical unit (AU)?

Both light-year and astronomical unit measure length & distance. Light-Year (ly) is a unit in the Length & Distance measurement category. It is widely used in interstellar astronomical distance. Relative to the length & distance base unit, 1 ly equals 9460730472580800 Meters (m). Astronomical Unit (AU) is a unit in the Length & Distance measurement category. It is widely used in earth-sun distance (solar system). Relative to the length & distance base unit, 1 AU equals 149597870700 Meters (m).

How many miles are in a kilometer?

There are approximately 0.621371 miles in 1 kilometer. To convert kilometers to miles quickly in your head, multiply by 6 and divide by 10 (or multiply by 0.6).