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Astronomical unit to Light-year
Convert Astronomical unit to Light-year and get the exact value instantly.
About this conversion
To convert Astronomical unit to Light-year, multiply the number of Astronomical unit by 0.00001581250741.
Length units straddle the metric and imperial systems, so everyday jobs (measuring a room, reading a map, or following a recipe from another country) often need a quick conversion between meters, feet, miles and inches.
Conversion table
| Astronomical unit (AU) | Light-year (ly) |
|---|---|
| 1 AU | 0.00001581250741 ly |
| 2 AU | 0.00003162501482 ly |
| 5 AU | 0.00007906253705 ly |
| 10 AU | 0.0001581250741 ly |
| 100 AU | 0.001581250741 ly |
How to use this converter
- Enter your Astronomical unit value
Type any number into the Astronomical unit field. It starts at 1 so you can read the rate straight away.
- Read the Light-year result
The amount in Light-year updates as you type, so there is no button to press and nothing to wait for.
- Swap or keep exploring
Use the swap control to flip the direction, or pick a related conversion from the list below.
Frequently asked
- How many Light-year are in one Astronomical unit?
- One Astronomical unit equals 0.00001581250741 ly. Enter any amount above to get an exact figure for your own value.
- Is this converter accurate?
- Yes. It uses the exact international definition of each unit and computes on your device, so the only rounding is for display.
- Do you upload the numbers I enter?
- No. The Astronomical unit to Light-year conversion runs entirely in your browser tab, and nothing you type is sent to a server.
- Does it work on my phone?
- Yes. It runs in any modern mobile browser and keeps working offline once the page has loaded.
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