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Convert light years to km

1 light year equals 9,460,730,500,000 kilometers. Enter a value below to convert instantly.

1 ly
9,460,730,500,000 km

Multiply the number of light years by 9460730472580.8 to get kilometers. How this is calculated

Copy link puts your number after the #, which browsers never send to a server — but the link itself carries it, so anyone you send it to sees the value. Save keeps the unit pair in this browser only; clear it any time from your saved list.

Need the other direction? Convert kilometer to light year →

Formula

Multiply the number of light years by 9460730472580.8 to get kilometers.

Step by step

  1. Start with 1 ly.
  2. Multiply by the conversion factor 9460730472580.8.
  3. 1 × 9460730472580.8 = 9,460,730,500,000 km.

Light Years to Kilometers conversion table

Light Years (ly) Kilometers (km)
1 9,460,730,500,000
2 18,921,461,000,000
3 28,382,191,000,000
5 47,303,652,000,000
10 94,607,305,000,000
20 189,214,610,000,000
50 473,036,520,000,000
100 946,073,050,000,000
500 4.7303652e+15
1,000 9.4607305e+15

Convert Light Year to other length units

1 ly expressed in every other length unit on this site.

  • Meter m 9.4607305e+15
  • Kilometer km 9,460,730,500,000
  • Hectometer hm 94,607,305,000,000
  • Dekameter dam 946,073,050,000,000
  • Decimeter dm 9.4607305e+16
  • Centimeter cm 9.4607305e+17
  • Millimeter mm 9.4607305e+18
  • Micrometer µm 9.4607305e+21
  • Nanometer nm 9.4607305e+24
  • Picometer pm 9.4607305e+27
  • Femtometer fm 9.4607305e+30
  • Attometer am 9.4607305e+33
  • Megameter Mm 9,460,730,500
  • Gigameter Gm 9,460,730.5
  • Terameter Tm 9,460.7305
  • Petameter Pm 9.4607305
  • Exameter Em 0.0094607305
  • Angstrom Å 9.4607305e+25
  • Mile mi 5,878,625,400,000
  • Yard yd 1.0346381e+16
  • Foot ft 3.1039142e+16
  • Inch in 3.724697e+17
  • Kiloyard kyd 10,346,381,000,000
  • League lea 1,959,541,800,000
  • Furlong fur 47,029,003,000,000
  • Chain ch 470,290,030,000,000
  • Rod rd 1.8811601e+15
  • Perch perch 1.8811601e+15
  • Pole pole 1.8811601e+15
  • Rope rope 1.5519571e+15
  • Fathom fath 5.1731903e+15
  • Link li 4.7029003e+16
  • Hand hand 9.3117426e+16
  • Ell ell 8.2771045e+15
  • Barleycorn barleycorn 1.1174091e+18
  • Mil mil 3.724697e+20
  • Microinch µin 3.724697e+23
  • Caliber cl 3.724697e+19
  • Centiinch cin 3.724697e+19
  • Nautical Mile nmi 5,108,385,800,000
  • Nautical Mile (UK) NM (UK) 5,105,122,000,000
  • Nautical League nl 1,702,795,300,000
  • Nautical League (UK) nl (UK) 1,701,707,300,000
  • Mile (US survey) mi (US) 5,878,613,600,000
  • Furlong (US survey) fur (US) 47,028,909,000,000
  • Chain (US survey) ch (US) 470,289,090,000,000
  • Rod (US survey) rd (US) 1.8811564e+15
  • Fathom (US survey) fath (US) 5.17318e+15
  • Foot (US survey) ft (US) 3.103908e+16
  • Link (US survey) li (US) 4.7028909e+16
  • Inch (US survey) in (US) 3.7246896e+17
  • League (statute) st.league 1,959,537,900,000
  • Pica pica 2.2348182e+18
  • Point pt 2.6817819e+19
  • Twip twip 5.3635637e+20
  • Astronomical Unit AU 63,241.077
  • Parsec pc 0.30660139
  • Kiloparsec kpc 0.00030660139
  • Megaparsec Mpc 3.0660139e-7
  • Earth's Equatorial Radius R⊕(eq) 1,483,306,200
  • Earth's Polar Radius R⊕(pol) 1,488,296,200
  • Earth's Distance from Sun d⊕☉ 63,240.177
  • Sun's Radius R☉ 13,598,865
  • Bohr Radius a₀ 1.787819e+26
  • Electron Radius (classical) rₑ 3.3573211e+30
  • Fermi F 9.4607305e+30
  • X-unit X 9.441093e+28
  • Planck Length ℓP 5.8534888e+50
  • Mile (Roman) mi (Rom) 6,393,232,100,000
  • Roman Actus actus 266,659,300,000,000
  • Arpent arpent 161,662,200,000,000
  • Cubit (UK) cubit 2.0692761e+16
  • Cubit (Greek) cubit (Gk) 2.0442904e+16
  • Long Cubit long cubit 1.7736653e+16
  • Reed reed 3.4487936e+15
  • Long Reed long reed 2.9561088e+15
  • Span (cloth) span 4.1385523e+16
  • Finger (cloth) finger 8.2771045e+16
  • Nail (cloth) nail 1.6554209e+17
  • Handbreadth handbreadth 1.2415657e+17
  • Fingerbreadth fingerbreadth 4.9662627e+17
  • Aln aln 1.5933116e+16
  • Famn famn 5.3110388e+15
  • Ken ken 4.4660636e+15
  • Russian Archin archin 1.3302489e+16
  • Vara Castellana vara (cast) 1.1328154e+16
  • Vara Conuquera vara (con) 3.7760513e+15
  • Vara de Tarea vara (tarea) 3.7760513e+15
  • Ja (Korean foot) 자 3.1220411e+16
  • Chi 치 3.1220411e+17
  • Pun 푼 3.1220411e+18
  • Gan 간 5.2034018e+15
  • Jang 장 3.1220411e+15
  • Ri (Korean) 리 24,089,823,000,000

About the light year

The light year (ly) is a Other unit of length. The distance light travels in one Julian year of 365.25 days.

About the kilometer

The kilometer (km) is a SI unit of length.

Where this conversion is used

Converting light years to kilometers comes up when measuring height, screen sizes, travel distances, fabric, and construction dimensions. Metric and Imperial length units are both in daily use, so quick conversion is often needed when following instructions from another country.

Related conversions

Frequently asked questions

How many kilometers are in a light year?

One light year equals 9,460,730,500,000 kilometers.

How do you convert light years to kilometers?

Multiply the number of light years by 9460730472580.8 to get kilometers.

What is 1 kilometer in light years?

One kilometer equals 1.0570008e-13 light years.

When would I convert light years to kilometers?

This conversion is common when measuring height, screen sizes, travel distances, fabric, and construction dimensions.

Conversion factors are based on internationally agreed unit definitions. See our methodology and sources for details on how these values are verified.