Astronomy DistanceKilometers to Astronomical Units

Kilometers to Astronomical Units

Methodology·How We Verify

Snapshot

1 Kilometer equals 6.68e-9 Astronomical Units.

Reference basis: This conversion uses a fixed factor based on canonical reference constants.
Example: For 2 Kilometers, the result equals 1.34e-8 Astronomical Units.

Interactive conversion

Converter Calculator

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

6.68e-9 Astronomical Units (AU)

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API and AI agent access

Kilometers to Astronomical Units.

Machine-readable identifiers

Conversion family: astronomy-distance
Source unit: kilometers
Target unit: astronomical_units

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-distance",
  "value": 1,
  "from": "kilometers",
  "to": "astronomical_units"
}

Essential response

{
  "ok": true,
  "conversion": {
    "family": "astronomy-distance",
    "value": 1,
    "from": "kilometers",
    "to": "astronomical_units",
    "result": {
      "raw": 6.68458712227e-9,
      "display": "6.68e-9"
    },
    "canonicalPath": "/astronomy-distance/kilometers-to-astronomical-units/"
  }
}

API, OpenAPI and WebMCP documentation

Explanation

Kilometers convert into astronomical units by reducing both units to meters and applying one fixed astronomy distance ratio.

Method & Reference

Method basis: exact conversion formula shown in Snapshot.
Applied factor: 1 Kilometer = 6.68e-9 Astronomical Units.
Consistency rule: calculator output and table values use the same constants and rounding policy.

Common Conversion Values

Kilometers (km)	Astronomical Units (AU)
1	6.68e-9
2	1.34e-8
5	3.34e-8
10	6.68e-8
100	6.68e-7
1000	0.000006684587

Questions & answers

Frequently Asked Questions

How is Kilometers to Astronomical Units calculated?

The factor is derived by reducing both units to meters and applying the fixed astronomy reference constants for AU, light-seconds, or lunar-distance scales.

How do I reverse Kilometers to Astronomical Units?

Use the mirror Astronomical Units to Kilometers route; it applies the inverse relationship for the opposite direction with the same assumptions.

Why is 1 kilometer such a small number of astronomical units?

Because 1 astronomical unit is about 149.6 million kilometers, a single kilometer is only a tiny fraction of 1 AU.