›› Measurement unit: light year

Full name: light year

Plural form: light years

Symbol: ly

Alternate spelling: lightyear

Category type: length

Scale factor: 9460730472580800


›› SI unit: metre

The SI base unit for length is the metre.
1 metre is equal to 1.05700083402E-16 light year.


›› Convert light year to another unit

Convert light year to  

Valid units must be of the length type.
You can use this form to select from known units:

Convert light year to  

I'm feeling lucky, show me some random units


›› Definition: Light-year

A light year, abbreviated ly, is the distance light travels in one year: roughly 9.46 × 1012 kilometres (9.46 petametres, or about 5.88 × 1012 (nearly six trillion) miles). More specifically, a light year is defined as the distance that a photon would travel, in free space and infinitely far away from any gravitational or magnetic fields, in one Julian year (365.25 days of 86400 seconds each).


›› Sample conversions: light year

light year to hair's breadth
light year to city block [East U.S.]
light year to pulgada
light year to myriametre
light year to yottametre
light year to miglio
light year to shaftment [ancient]
light year to military pace [double time]
light year to tu
light year to quarter