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Math
 
light-year
Symbol:  ly 
Category:  Length 
SI Equivalent:  9.46053×1015 m
Dimension:  L 
 
Notes
Unit used in astronomy and astrophysics. This is the distance light travels in the vacuum in a (tropical) year.
Convert     ly  
1 ly =
Length
  Symbol Unit Name
1.78778×1026  a.u., a0, b  a.u. of length 
9.46053×1025  Å  angstrom 
3.25229×1019  arcmin  arcmin 
6.32397×104  AU, UA  astronomical unit 
9.46053×1033  am  attometer 
1.11739×1018    barleycorn (UK) 
1.78778×1026  a0, b  bohr (first Bohr radius) 
2.58654×1014    bolt (US cloth) 
4.46954×1018  line (UK)  button (UK) 
1.48985×1019  line (US)  button (US) 
5.10828×1013    cable length (int.) 
5.10501×1013    cable length (UK) 
4.3109×1013    cable length (US) 
3.72462×1019  caliber, cin  caliber (centiinch) 
9.46053×1017  cm  centimeter 
3.10385×1014  ch  chain (engineer's) 
4.7028×1014  ch  chain (Gunter's) 
3.10385×1014  ch  chain (Ramsden's) 
4.7028×1014  ch  chain (surveyor's) 
2.06923×1016    cubit (UK) 
9.46053×1014  dam  decameter 
9.46053×1016  dm  decimeter 
3.35725×1030  re  electron classical radius 
8.27693×1015    ell 
2.24316×1018    ems (pica) 
9.46053×10-3  Em  exameter 
5.17308×1015  fath  fathom 
9.46053×1030  fm  femtometer 
9.46053×1030  F, f  fermi 
1.78778×1026  a0, b, a.u.  first Bohr radius 
3.10385×1016  ft  foot 
2.83816×1019  fr  French 
4.7028×1013  fur  furlong (UK) 
4.7028×1013  fur  furlong (US) 
9.46053×106  Gm  gigameter 
9.31155×1016  hd  hand (UK) 
9.46053×1013  hm  hectometer 
1×10-9    hubble 
3.72462×1017  in  inch 
9.46053×1012  km  kilometer 
3.06595×10-4  kpc  kiloparsec 
1.95992×1012    league (Canadian) 
1.70276×1012  leag. (int. naut.)  league (int. naut.) 
1.9595×1012  leag. (stat.)  league (statute, land) 
1.70167×1012  leag. (UK, naut.)  league (UK, naut.) 
1.70167×1012  leag. (US, naut.)  league (US, naut.) 
365.242    light-day 
8765.81    light-hour 
5.25949×105    light-minute 
3.15569×107    light-second 
4.46954×1018  line (UK)  line (UK) 
1.48985×1019  line (US)  line (US) 
3.10385×1016    link (engineer's) 
4.7028×1016    link (Gunter's) 
3.10385×1016    link (Ramsden's) 
4.7028×1016    link (surveyor's) 
9.46053×109  Mm  megameter 
9.46053×1015  m  meter 
3.72462×1023  µin  microinch 
9.46053×1021  µm  micron 
3.72462×1020  mil, thou  mil (thou) 
1.27473×1012  mile (geogr.)  mile (geographical) 
5.87849×1012  mi (int.)  mile (international) 
5.10828×1012  mi (naut., int.)  mile (nautical, international) 
5.09914×1012  mi (naut., teleg.)  mile (nautical, telegraph) 
5.10501×1012  mi (naut., UK, US)  mile (nautical, UK, US) 
5.8785×1012  mi (stat.)  mile (statute, land) 
5.87849×1012  mi (survey, US)  mile (survey, US) 
9.46053×1018  mm  millimeter 
9.46053×1024  mµ, nm  millimicron 
4.13846×1016    nail (UK) 
9.46053×1024  nm  nanometer 
5.10828×1012  mi (int. naut.)  nautical mile (international) 
5.10501×1012  mi (UK, US, naut.)  nautical mile (UK, US) 
1.24154×1016    pace (UK) 
1.24154×1017    palm (UK) 
0.306595  pc  parsec 
1.88112×1015  rd  perch (rod, pole) 
9.46053  Pm  petameter 
2.24315×1018    pica 
9.46053×1027  pm  picometer 
2.69178×1019    point (US printer's) 
1.88112×1015  rd  pole (rod, perch) 
9.46053×108    quadrant 
1.88112×1015  rd  rod (perch, pole) 
1.55192×1015    rope (UK) 
4.13846×1016    span 
9460.53  Tm  terameter 
3.72462×1020  thou, mil  thou (mil) 
9.45856×1028  UX, X  X-unit 
1.03462×1016  yd  yard 
9.46053×1039  ym  yoctometer 
9.46053×10-9  Ym  yottameter 
9.46053×1036  zm  zeptometer 
9.46053×10-6  Zm  zettameter 
Glossary
FREE Publications
Selecting the Right 3D Printer

Discover how to choose the right 3D printer for your needs and the key performance attributes to consider.

Mechanical Engineers Outlook

Guide for those interested in becoming a mechanical engineer. Includes qualifications, pay, and job duties.

Injection Molding Design Guide

Guide for high quality and cost-effective plastic injection molding.

Negotiate Your Salary

Learn the best principles to negotiate the salary you deserve!

more publications