Astronomy SizeAstronomical Units to Earth Radii

Astronomical Units to Earth Radii

Snapshot

1 Astronomical Unit equals 23,481.033443 Earth Radii. Conversion Encyclopedia uses the same fixed conversion basis across the calculator, common values, and reverse page for this page.

Reference basis: This conversion uses fixed astronomy size constants anchored to meters.
Example: For 2 Astronomical Units, the result equals 46,962.066886 Earth Radii.
Use the reverse page if you need the opposite direction with the same basis.

Use the interactive calculator below for custom values and the common-value table for quick checks.

Interactive conversion

Converter Calculator

23,481.033443 Earth Radii (R_earth)

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Machine access

Available to apps and AI agents

Astronomical Units to Earth Radii can be requested through Conversion Encyclopedia's structured interfaces by software and compatible AI agents. The identifiers below select the same calculation as the calculator.

Machine-readable identifiers

Conversion family: astronomy-size
Source unit: astronomical_units
Target unit: earth_radii

The JSON API and OpenAPI specification use the identifiers to reach the conversion engine. WebMCP lets compatible AI agents request the same calculation.

Example API request and response

POST /api/v1/convert

Request

{
  "family": "astronomy-size",
  "value": 1,
  "from": "astronomical_units",
  "to": "earth_radii"
}

Essential response

{
  "ok": true,
  "conversion": {
    "family": "astronomy-size",
    "value": 1,
    "from": "astronomical_units",
    "to": "earth_radii",
    "result": {
      "raw": 23481.0334432,
      "display": "23,481.033443"
    },
    "canonicalPath": "/astronomy-size/astronomical-units-to-earth-radii/"
  }
}

Full API documentation

Explanation

This page converts Astronomical Units into Earth Radii using fixed astronomy size constants anchored to meters. The direct answer, calculator, and common values table all follow the same factor.

Formula: Earth Radii = Astronomical Units × 23,481.033443. Why: standard metric units are used as the common size basis, then planetary or stellar reference constants are applied to reach the target scale.

Astronomical Units (AU): a Solar System distance unit that can also be used to express very large size scales in familiar orbital terms.

Earth Radii (R_earth): a planetary reference unit based on Earth's mean radius.

This route is useful when expressing planetary or stellar size references in metric units, or restating metric sizes in familiar astronomy reference scales.

Because the route stays inside one meter-based reference model, the mirror page reverses the same constants without changing the underlying assumptions.

Method & Reference

Method basis: exact conversion formula shown in Snapshot.
Applied factor: 1 Astronomical Unit = 23,481.033443 Earth Radii.
Consistency rule: calculator output and table values use the same constants and rounding policy.

Common Conversion Values

Astronomical Units (AU)	Earth Radii (R_earth)
1	23,481.033443
2	46,962.066886
5	117,405.167216
10	234,810.334432
100	2,348,103.34432
1,000	23,481,033.4432

Questions & answers

Frequently Asked Questions

What is 1 astronomical unit in earth radii?

1 Astronomical Unit equals 23,481.033443 Earth Radii on this page.

Does this Astronomical Units to Earth Radii page convert through meters first?

Yes. Standard metric units act as the shared size basis, and the astronomy reference unit is then applied through its fixed meter constant.

When would I convert astronomical units to earth radii?

This route is useful when expressing planetary or stellar size references in metric units, or restating metric sizes in familiar astronomy reference scales.

How do I reverse Astronomical Units to Earth Radii?

Use the mirror Earth Radii to Astronomical Units route; it reverses the same astronomy size constants without changing the underlying assumptions.