Astronomy SizeAstronomical Units to Kilometers

Astronomical Units to Kilometers

Methodology·How We Verify

Snapshot

1 Astronomical Unit equals 149,597,870.7 Kilometers.

Reference basis: This conversion uses fixed astronomy size constants anchored to meters.
Example: For 2 Astronomical Units, the result equals 299,195,741.4 Kilometers.

Interactive conversion

Converter Calculator

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

149,597,870.7 Kilometers (km)

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API and AI agent access

Astronomical Units to Kilometers.

Machine-readable identifiers

Conversion family: astronomy-size
Source unit: astronomical_units
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": "astronomical_units",
  "to": "kilometers"
}

Essential response

{
  "ok": true,
  "conversion": {
    "family": "astronomy-size",
    "value": 1,
    "from": "astronomical_units",
    "to": "kilometers",
    "result": {
      "raw": 149597870.7,
      "display": "149,597,870.7"
    },
    "canonicalPath": "/astronomy-size/astronomical-units-to-kilometers/"
  }
}

API, OpenAPI and WebMCP documentation

Explanation

Astronomical Units convert into kilometers using fixed astronomy size constants anchored to meters. Formula: km = AU × 149597870.7. 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 Astronomical Unit = 149,597,870.7 Kilometers.
Consistency rule: calculator output and table values use the same constants and rounding policy.

Common Conversion Values

Astronomical Units (AU)	Kilometers (km)
1	149,597,870.7
2	299,195,741.4
5	747,989,353.5
10	1,495,978,707
100	14,959,787,069.999998
1000	149,597,870,700

Questions & answers

Frequently Asked Questions

What is 1 astronomical unit in kilometers?

1 Astronomical Unit equals 149,597,870.7 Kilometers on this page.

Does this Astronomical Units 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 astronomical units 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 Astronomical Units to Kilometers?

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