# Kilometers to Mega-parsecs

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vCalc.Kilometers to Mega-parsecs
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The Kilometers to Mega-Parsecs calculator converts a measurement of length in kilometers to mega-parsecs.

INSTRUCTIONS: Choose units and enter the following:

• (km)  This is the distance in kilometers

Mega-Parsec(Mpc):  The calculator returns the distance in mega-parsecs.  However, this can be automatically converted to other units via the pull-down menu.

#### The Math / Science

A parsec was traditionally defined as the distance where one astronomical unit subtends an angle of one arcsecond.  A parsec was redefined in 2015 to 648000/π astronomical units.  A mega-parsec is one million parsecs.

Mega-parsecs are used in Astronomy Calculations when more conventional units such as kilometers are too small for easy comprehension, and the conversion from common length units to astronomical units is a simple linear transform for the distances to remote galaxies.