Aisha K.
Mar 12, 2026
Clean layout and the results update instantly. Exactly what I needed for a quick planning check.
Unit Converters
Astronomical Units to Kilometers Converter (au to km)
kilometers = au × 149,597,870.7. 1 au = 149,597,870,700 m exactly.
The IAU 2012 astronomical unit is exactly 149,597,870,700 m — about 149.6 million km. Earth–Sun mean distance sits on that stick. Mars at 1.524 au is not a NASA press-round; it is that constant times 1.524.
Astronomical units
au → km
149,597,870.7 km
1 au = 149,597,870.7 km. 5.2 au (Jupiter-ish) ≈ 777,908,927 km.
- You typed
- 1 au
- One km is
- 6.6846e-9 au
- How it’s calculated
- kilometers = au × 149,597,870.7. 1 au = 149,597,870,700 m exactly.
Plain-English guide
Terms & how it works
Confused by a field? Read the short definitions here while you use the tool.
Astronomical units
The “Astronomical units” value used in this tool’s formula. Adjust it to see results update live.
How this calculator works
The IAU 2012 astronomical unit is exactly 149,597,870,700 m — about 149.6 million km. Earth–Sun mean distance sits on that stick. Mars at 1.524 au is not a NASA press-round; it is that constant times 1.524. kilometers = au × 149,597,870.7. 1 au = 149,597,870,700 m exactly. Example: 1 au = 149,597,870.7 km. 5.2 au (Jupiter-ish) ≈ 777,908,927 km.
kilometers = au × 149,597,870.7. 1 au = 149,597,870,700 m exactly.
Example: 1 au = 149,597,870.7 km. 5.2 au (Jupiter-ish) ≈ 777,908,927 km.
When to use this Astronomical Units to Kilometers
Common use cases
- The IAU 2012 astronomical unit is exactly 149,597,870,700 m — about 149.6 million km. Earth–Sun mean distance sits on that stick. Mars at 1.524 au is not a NASA press-round; it is that constant times 1.524.
- Sanity-check with this case: 1 au = 149,597,870.7 km. 5.2 au (Jupiter-ish) ≈ 777,908,927 km.
- The relationship is: kilometers = au × 149,597,870.7. 1 au = 149,597,870,700 m exactly.
Localized examples
- Unit Converters: the example on this page uses the same formula as the widget.
What you get
- Fields: Astronomical units
- kilometers = au × 149,597,870.7. 1 au = 149,597,870,700 m exactly.
- Example on the page: 1 au = 149,597,870.7 km. 5.2 au (Jupiter-ish) ≈ 777,908,927 km.
How to Convert Astronomical Units to Kilometers Step-by-Step
- 1Enter Astronomical units. Use the values you have, not a catalog average, unless that is all you know.
- 2kilometers = au × 149,597,870.7. 1 au = 149,597,870,700 m exactly.
- 3Worked case: 1 au = 149,597,870.7 km. 5.2 au (Jupiter-ish) ≈ 777,908,927 km.
- 4Check which dictionary the other person is using — US or UK, decimal or 1,024 — then trust the number.
Governing formula
kilometers = au × 149,597,870.7. 1 au = 149,597,870,700 m exactly.
1 au = 149,597,870.7 km. 5.2 au (Jupiter-ish) ≈ 777,908,927 km.
Example: set Astronomical units = 1, then read the result.
Variable definitions
- value
Astronomical units
The “Astronomical units” field. Default 1; typical range 0–1000000000.
- The conversion (kilometers = au × 149,597,870.7. 1 au = 149,597,870,700 m exactly.) does not pick US vs UK gallons, SI vs binary megabytes, or Mach at altitude for you. Read the footnote on the page.
- Nothing here is uploaded for the calculation itself.
Frequently Asked Questions
No. It is a fixed length. Earth’s actual distance still wobbles.
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Daniel R.
Feb 28, 2026
Very usable on mobile. Would love a save/export option later, but the math feels solid.
Priya S.
Feb 3, 2026
The FAQ section answered my questions before I even had to search. Smooth dark mode too.
Marcus L.
Jan 19, 2026
Simple inputs, clear outputs. This replaced three bookmarks I used to juggle.
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