Astronomical Converter
Convert astronomical distance units instantly in the browser.
What Is Astronomical Converter?
The Astronomical Converter lets you switch between common astronomical distance units (like astronomical unit, light year, and parsec) and more everyday units (meter, kilometer, mile). It runs entirely in your browser and updates instantly as you change values.
Which Units Are Supported?
Choose a From unit and a To unit. This tool supports: astronomical unit (1996), meter, kilometer, mile, parsec, and light-distance units (light second/minute/hour/day/year), including Julian, tropical, and traditional light years.
How Conversion Works
Light-distance units are based on the speed of light and the selected year definition. Other units use standard physical definitions so your conversions remain consistent.
Frequently Asked Questions
Why are there multiple “light year” options?
Different year definitions produce slightly different lengths for the “year” used to compute a light year. Use the option that matches your reference.
Is the conversion done locally in the browser?
Yes. The tool performs all calculations client-side, so your input stays on your device.
Can I enter fractional values?
Yes. The input accepts decimal numbers, so you can convert fine-grained distances.
What level of precision should I expect?
The tool formats results with a sensible number of significant digits. For long decimal chains, you may still want to round to your required precision.
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