›› 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 1.0570008340246E-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  

›› 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 em
light-year to palm [US, Roman major]
light-year to foot [pre-1963 Canada]
light-year to centímetro
light-year to story
light-year to league [UK nautical]
light-year to pik
light-year to nail
light-year to ell [English]
light-year to pulgada