How many kilometers are in one astronomical unit?

One astronomical unit equals 149,597,870.691 kilometers, which is the standard conversion used by most of the tools in this group.

Can I convert astronomical units to light years?

Yes, several tools in this group support light-year conversions, including OnlineConversion.com and Convertworld, which list light years alongside AU in their unit selectors.

What is the difference between a light year and an astronomical unit?

A light year is the distance light travels in one year, about 63,241 AU, so a light year is vastly larger than an astronomical unit, which is the Earth-Sun distance.

How do I convert AU to parsecs?

One AU equals approximately 0.000004848 parsecs; you can multiply the AU value by this factor, or use a converter that shows the reverse factor of 1 parsec equals 206,265 AU.

Is there a mobile-friendly astronomical unit calculator?

Yes, Calculateme.com and OnlineConversion.com both offer mobile-friendly interfaces that let you input a value and swap between units like kilometers, light minutes, and parsecs.

General Conversion6 options compared

Astronomical Unit Calculator

Converts measurements related to astronomical distance between various units. This mobile-friendly tool allows users to convert values starting with or converting into Astronomical Units (AU). It supports conversions involving kilometers, light minutes, light seconds, light years, miles, and parsecs. The interface displays a worked result for clarity and provides the functionality to easily swap...

Length and area converters

Editors’ Top PickBased on community votes

OnlineConversion.com

onlineconversion.com

Astronomical conversion tool with from/to unit selectors that include astronomical unit, kilometers, light-seconds, l...

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Other OptionsRanked by votes

02
02
UnitConverters.net
unitconverters.net
Converts astronomical units (AU) to kilometers and back with input fields and a conversion table. Includes worked exa...
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03
03
Convertworld
convertworld.com
Astronomical unit converter that lets you enter AU values and see conversions across metric, imperial, nautical, and ...
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04
04
Omni Calculator
omnicalculator.com
Our astronomical unit calculator will rescale your universe according to the distance between Earth and Sun.
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05
05
CalculateMe
calculateme.com
Mobile-friendly astronomical unit converter that lets you convert between AU and kilometers, light minutes, light sec...
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06
06
UnitJuggler
unitjuggler.com
Astronomical unit conversion page that converts AU to parsecs with an input field, calculated result, and conversion ...
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Side by side

Astronomical Unit Calculator options compared

Tool	Best for	Strengths	Limitations
OnlineConversion.com onlineconversion.com	Quick AU conversions with many unit options	Mobile-friendly interface Includes light minutes, light hours, light days, and light years	Page includes ads and forum links No conversion formula or examples provided
UnitConverters.net unitconverters.net	AU-to-kilometer with formula reference	Conversion table with values from 0.01 to 1000 AU Includes AU-to-km formula and worked example	Only converts to/from kilometers No light-year or parsec options
Convertworld convertworld.com	Seeing AU relative to many units at once	Table shows conversions to miles, kilometers, parsecs, and nautical miles Clean layout without ads or forums	Only one-directional display (AU to other units) No input field for custom values
Omni Calculator omnicalculator.com	Understanding AU scale with educational context	Explains what an AU is and how it compares to light years and parsecs Allows input in meters, kilometers, or light-years	Educational article style, not a simple calculator Fewer unit options than OnlineConversion.com
CalculateMe calculateme.com	Mobile-friendly AU conversion with unit swapping	Mobile-friendly design Lets you swap between AU, km, light minutes, light seconds, light years, miles, and parsecs	Live page could not be fetched, so reliability is uncertain Community votes lowest of the group
UnitJuggler unitjuggler.com	Converting AU to parsecs specifically	Provides exact conversion factor: 1 AU equals 0.000004848 parsecs Includes reverse conversion (parsec to AU)	Only converts AU to parsecs, no other units

Buyer's guide

How to choose a astronomical unit calculator

When picking an astronomical unit calculator, first decide which units you actually need — if you only need kilometers, a dedicated converter like UnitConverters.net saves time. If you are comparing AU to light years, light minutes, or parsecs, choose a tool that lists all those options together so you can see the scale at a glance. Also consider whether you want an input field for custom values or a static table; input fields work better for specific numbers, while tables are quicker for reference checks.

Questions

Astronomical Unit Calculator FAQ

How many kilometers are in one astronomical unit?: One astronomical unit equals 149,597,870.691 kilometers, which is the standard conversion used by most of the tools in this group.
Can I convert astronomical units to light years?: Yes, several tools in this group support light-year conversions, including OnlineConversion.com and Convertworld, which list light years alongside AU in their unit selectors.
What is the difference between a light year and an astronomical unit?: A light year is the distance light travels in one year, about 63,241 AU, so a light year is vastly larger than an astronomical unit, which is the Earth-Sun distance.
How do I convert AU to parsecs?: One AU equals approximately 0.000004848 parsecs; you can multiply the AU value by this factor, or use a converter that shows the reverse factor of 1 parsec equals 206,265 AU.
Is there a mobile-friendly astronomical unit calculator?: Yes, Calculateme.com and OnlineConversion.com both offer mobile-friendly interfaces that let you input a value and swap between units like kilometers, light minutes, and parsecs.

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