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Unit Conversions · Specialized measurement

Astronomical Distance Converter

Convert metres, kilometres, astronomical units, light-years, parsecs, kiloparsecs, and megaparsecs from one canonical distance basis.

Unit Conversions · Specialized measurement

Convert astronomical distance

Private in-browser conversion · common equivalents included

Enter one finite number. This quantity is treated as a magnitude, so the value cannot be negative. Select explicitly labeled units—especially where US, Imperial, decimal, or binary conventions differ. Results stay in this browser.

Conversion result

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Enter valid values to see the result.

Your entries are calculated in this browser and are not submitted to 365CALCS.COM.

Quick guide

How to use this calculator

  1. Enter the value exactly as recorded, then choose its source unit and the unit you need.
  2. Check regional and technical qualifiers in the unit names. US and Imperial gallons, force and mass, absolute temperatures and temperature differences, and decimal and binary data prefixes are deliberately separate.
  3. Use the selected result first, then open the common-equivalents table when you need to compare several standards without re-entering the value.

Calculation method

How the astronomical distance converter works

The entered astronomical distance is converted once to the canonical metre basis and then from that basis to the selected output unit.

The astronomical unit is exact; the light-year follows the Julian year and exact speed of light. Parsec values are represented from the astronomical-unit geometry and are not cosmological distance estimates.

Worked example

Astronomical Distance example

1 parsec is approximately 3.26156 light-years, while 1 Mpc is one million parsecs.

source value × source-to-metre relationship → canonical metre value → destination-unit relationship

Supported inputs

Precision and limits

Unit convention

The astronomical unit is exact; the light-year follows the Julian year and exact speed of light. Parsec values are represented from the astronomical-unit geometry and are not cosmological distance estimates.

Precision

Definitions and exact conventional factors are retained internally where available. Display formatting uses up to 12 significant digits; very large or small results use scientific notation. Do not treat displayed digits as measurement accuracy beyond the source value.

Quantity boundary

This page converts astronomical distance. It does not infer a different physical quantity, material property, environmental condition, exchange rate, calendar rule, or regulatory value needed to make a cross-quantity conversion.

Privacy

Entered values and converted results stay in this browser and are not sent to analytics or third parties.

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