Space distances converters

11 converters. Light-years, astronomical units and parsecs to kilometers and miles, each with the formula and the math worked out with your numbers.

Light-years

Light-years to kilometers ly → km 4.24 ly = 40,113,497,203,742.6 km Kilometers to light-years km → ly 1,000,000,000,000 km = 0.11 ly Light-years to miles ly → mi 4.24 ly = 24,925,371,582,298.5 mi Miles to light-years mi → ly 1,000,000,000,000 mi = 0.17 ly

Astronomical units

Astronomical units to kilometers au → km 1 au = 149,597,870.7 km Kilometers to astronomical units km → au 225,000,000 km = 1.5 au Astronomical units to miles au → mi 1 au = 92,955,807.27 mi Astronomical units to light-years au → ly 1 au = 0.0000158 ly

Parsecs

Parsecs to light-years pc → ly 1 pc = 3.26 ly Light-years to parsecs ly → pc 4.24 ly = 1.3 pc Parsecs to kilometers pc → km 1 pc = 30,856,775,814,913.7 km

Space distances units at a glance

Unit	Symbol	In kilometers	Defined as
Kilometer	km	1	1,000 m
Mile	mi	1.609344	5,280 ft
Astronomical unit	au	149,597,870.7	149,597,870.7 km (IAU)
Light-year	ly	9,460,730,472,580.8	9,460,730,472,580.8 km
Parsec	pc	30,856,775,814,913.7	648,000/π au ≈ 3.2616 ly

A light-year is the distance light travels in a Julian year of 365.25 days. The astronomical unit has been fixed at exactly 149,597,870,700 m since 2012, roughly the Earth–Sun distance. A parsec is the distance at which 1 au spans one arcsecond.