Kilometers to Astronomical Units

1 Kilometer equals 6.68e-9 Astronomical Units using fixed astronomy size constants anchored to meters.

Direct Answer

1 Kilometer equals 6.68e-9 Astronomical Units

This conversion uses fixed astronomy size constants anchored to meters.

For 2 Kilometers, the result equals 1.34e-8 Astronomical Units.

Converter Calculator

6.68e-9 Astronomical Units (AU)

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Explanation

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

Formula: Astronomical Units = Kilometers × 6.68e-9. Why: standard metric units are used as the common size basis, then planetary or stellar reference constants are applied to reach the target scale.

Kilometers (km): a practical metric unit for planetary and orbital size scales.

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

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 Direct Answer.
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
1,000	0.000007

Frequently Asked Questions

What is 1 kilometer in astronomical units?

1 Kilometer equals 6.68e-9 Astronomical Units on this page.

Does this Kilometers to Astronomical Units 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 astronomical units?

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 Astronomical Units?

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