Astronomy SizeEarth Radii to Kilometers

Earth Radii to Kilometers

Methodology·How We Verify

Snapshot

1 Earth Radius equals 6,371.0088 Kilometers.

Reference basis: This conversion uses fixed astronomy size constants anchored to meters.
Example: For 2 Earth Radii, the result equals 12,742.0176 Kilometers.

Interactive conversion

Converter Calculator

Decimals: 1.5 or 1,5. Fractions: 1/2. Scientific notation: 1e3. Write 1000 without grouping separators.

6,371.0088 Kilometers (km)

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API and AI agent access

Earth Radii to Kilometers.

Machine-readable identifiers

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

Use these identifiers in the API request. Sources and model limits also apply to software clients.

Example API request and response

POST /api/v1/convert

Request

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

Essential response

{
  "ok": true,
  "conversion": {
    "family": "astronomy-size",
    "value": 1,
    "from": "earth_radii",
    "to": "kilometers",
    "result": {
      "raw": 6371.0088,
      "display": "6,371.0088"
    },
    "canonicalPath": "/astronomy-size/earth-radii-to-kilometers/"
  }
}

API, OpenAPI and WebMCP documentation

Explanation

Earth Radii convert into kilometers using fixed astronomy size constants anchored to meters. Formula: km = R_earth × 6371.0088. That keeps the snapshot, calculator, table, and mirror page aligned on one constant basis.

It is useful for comparing planetary, stellar, and orbital-scale size references without switching between inconsistent reference tables.

Method & Reference

Method basis: exact conversion formula shown in Snapshot.
Applied factor: 1 Earth Radius = 6,371.0088 Kilometers.
Consistency rule: calculator output and table values use the same constants and rounding policy.

Common Conversion Values

Earth Radii (R_earth)	Kilometers (km)
1	6,371.0088
2	12,742.0176
5	31,855.044
10	63,710.088
100	637,100.88
1000	6,371,008.8

Questions & answers

Frequently Asked Questions

What is 1 earth radius in kilometers?

1 Earth Radius equals 6,371.0088 Kilometers on this page.

Does this Earth Radii to Kilometers 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 earth radii to kilometers?

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 Earth Radii to Kilometers?

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