Astronomical Unit Converter
Convert astronomical distances between AU, kilometers, miles, light-seconds, light-minutes, light-hours, light-days, light-years and parsecs at once, with the light travel time for the distance.
Input
Output
| Unit | Value |
|---|---|
| No data yet | |
More ways to use this tool
REST API
curl -X POST https://api.iotools.cloud/v1/tool/astronomical-unit-converter \
-H "Authorization: Bearer YOUR_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"value": "1",
"fromUnit": "au",
"precision": "6"
}'Swap in your own key from your account. The tool's fields are the body — no wrapper.
Ask an AI agent
Use the IOTools `astronomical-unit-converter` tool (Astronomical Unit Converter) on this input:
YOUR_INPUT_HEREPaste this at any agent connected to the IOTools MCP server, then add your input.
Embed widget
<iframe
src="https://iotools.cloud/embed/astronomical-unit-converter/"
width="100%" height="520" frameborder="0" scrolling="no" loading="lazy"
title="Astronomical Unit Converter — iotools.cloud"
sandbox="allow-scripts allow-forms allow-same-origin allow-downloads allow-popups allow-popups-to-escape-sandbox"
allow="clipboard-write"
style="width:100%;border:1px solid #e5e7eb;border-radius:12px;overflow:hidden"></iframe>
<script src="https://iotools.cloud/embed.js" async></script>Drop this into your own page — free, no key required, just a link back.
| Cost per API/MCP call | From 5 credits |
|---|---|
| Need more credits? | View pricing |
Also available with
Guides
The Astronomical Unit Converter turns one space distance into nine units at once: astronomical units (AU), kilometers, miles, light-seconds, light-minutes, light-hours, light-days, light-years and parsecs. It also shows how long light takes to travel that distance.
An astronomical unit is the average Earth–Sun distance, fixed by the IAU at exactly 149,597,870,700 meters. It is the natural yardstick inside the solar system, while light-years and parsecs take over between stars.
How to use it
- Enter a distance and choose its unit.
- Pick how many decimals to show.
- Read the table, and copy or download it as CSV.
Handy references
- Earth to Sun: 1 AU, about 8 minutes 19 seconds of light time
- Sun to Neptune: about 30 AU
- 1 light-year: about 63,241 AU
- 1 parsec: about 206,265 AU, or 3.26 light-years
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