Mile to Light Year Converter

About this conversion

The mile (mi) is a unit of length in the imperial / US customary, commonly used for road distances in the US and UK and running race distances. The light-year (ly) belongs to the astronomical and is typically found in measurements related to distances to nearby stars and sizes of galaxies. By definition, one mile is exactly 1,760 yards, or approximately 1.609 kilometers. One light-year is the distance light travels in one Julian year in a vacuum, approximately 9.461 × 10¹⁵ meters. The conversion factor between these two units is 1.7010834293445517e-13: multiplying any value in mi by this number gives the equivalent in ly. For example, 10 mi equals 0.0000 ly. Going the other direction, 1 ly equals 5878606438399.745117 mi. The mile descends from the Roman mille passuum ('thousand paces'). The statute mile of 5,280 feet was fixed in England in 1593.