Astronomy SizeKilometers to Earth Radii

Kilometers to Earth Radii

Methodology·How We Verify

Snapshot

1 Kilometer equals 0.000157 Earth Radii.

Reference basis: This conversion uses fixed astronomy size constants anchored to meters.
Example: For 2 Kilometers, the result equals 0.000314 Earth Radii.

Interactive conversion

Converter Calculator

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

0.000157 Earth Radii (R_earth)

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API and AI agent access

Kilometers to Earth Radii.

Machine-readable identifiers

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

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": "kilometers",
  "to": "earth_radii"
}

Essential response

{
  "ok": true,
  "conversion": {
    "family": "astronomy-size",
    "value": 1,
    "from": "kilometers",
    "to": "earth_radii",
    "result": {
      "raw": 0.000156961013772,
      "display": "0.000157"
    },
    "canonicalPath": "/astronomy-size/kilometers-to-earth-radii/"
  }
}

API, OpenAPI and WebMCP documentation

Explanation

Kilometers convert into earth radii using fixed astronomy size constants anchored to meters. Formula: R_earth = km × 0.000156961013772. 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 Kilometer = 0.000157 Earth Radii.
Consistency rule: calculator output and table values use the same constants and rounding policy.

Common Conversion Values

Kilometers (km)	Earth Radii (R_earth)
1	0.000157
2	0.000314
5	0.000785
10	0.00157
100	0.015696
1000	0.156961

Questions & answers

Frequently Asked Questions

What is 1 kilometer in earth radii?

1 Kilometer equals 0.000157 Earth Radii on this page.

Does this Kilometers 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 kilometers 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 Kilometers to Earth Radii?

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