Convert kilometers to light-years
1 km = 0.000000000000105700083402 ly — exactly. Both units are defined against the SI, so this factor is a fraction, not an approximation.
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Show this value in all 50 length units
- Gigameters Gm 0.000 001
- Megameters Mm 0.001
- Kilometers km 1
- Hectometers hm 10
- Decameters dam 100
- Meters m 1000
- Decimeters dm 10 000
- Centimeters cm 100 000
- Millimeters mm 1 000 000
- Micrometers µm 1 000 000 000
- Nanometers nm 1 000 000 000 000
- Picometers pm 1 000 000 000 000 000
- Femtometers fm 1e+18
- Inches in 39 370.078 740 2
- Feet ft 3280.839 895 01
- Yards yd 1093.613 298 34
- Miles mi 0.621 371 192 237
- Nautical miles nmi 0.539 956 803 456
- Thous thou 39 370 078.7402
- Hands hh 9842.519 685 04
- Links li 4970.969 537 9
- Spans span 4374.453 193 35
- Cubits cubit 2187.226 596 68
- Ells ell 874.890 638 67
- Fathoms ftm 546.806 649 169
- Rods rd 198.838 781 516
- Chains ch 49.709 695 379
- Furlongs fur 4.970 969 537 9
- Leagues lea 0.207 123 730 746
- Barleycorns barleycorn 118 110.236 22
- US survey feet ft (US) 3280.833 333 33
- US survey miles mi (US) 0.621 369 949 495
- Ångströms Å 10 000 000 000 000
- Microns µ 1 000 000 000
- Bohr radiuss a₀ 18 897 261 259 100
- Planck lengths ℓₚ 6.18714249917e+37
- Astronomical units au 6.68458712227e-9
- Light-years ly 1.05700083402e-13
- Light-seconds ls 0.000 003 335 640 951 98
- Light-minutes lmin 5.55940158664e-8
- Parsecs pc 3.24077928944e-14
- Kiloparsecs kpc 3.24077928944e-17
- Megaparsecs Mpc 3.24077928944e-20
- Solar radiuss R☉ 0.000 001 437 401 178 67
- Earth radiuss R🜨 0.000 156 961 230 576
- Point (DTP)s pt 2 834 645.669 29
- Picas pc 236 220.472 441
- Scandinavian miles mil 0.1
- Versts вер 0.937 382 827 147
- Lis 里 2
Every row is Kilometer (km) converted through the meter, in exact rational arithmetic.
How to convert kilometers to light-years
Multiply the number of kilometers by 0.000000000000105700083402 to get light-years.
Light-year: Light travelling for one Julian year (365.25 days) in vacuum — exact, since both inputs are defined values.
Kilometer to Light-year conversion table
| Kilometers (km) | Light-years (ly) |
|---|---|
| 1 km | 1.0570008e-13 |
| 2 km | 2.1140017e-13 |
| 3 km | 3.1710025e-13 |
| 5 km | 5.2850042e-13 |
| 10 km | 1.0570008e-12 |
| 20 km | 2.1140017e-12 |
| 25 km | 2.6425021e-12 |
| 50 km | 5.2850042e-12 |
| 100 km | 1.0570008e-11 |
| 250 km | 2.6425021e-11 |
| 500 km | 5.2850042e-11 |
| 1000 km | 1.0570008e-10 |
Light-year to Kilometer conversion table
| Light-years (ly) | Kilometers (km) |
|---|---|
| 1 ly | 9 460 730 500 000 |
| 2 ly | 18 921 461 000 000 |
| 3 ly | 28 382 191 000 000 |
| 5 ly | 47 303 652 000 000 |
| 10 ly | 94 607 305 000 000 |
| 20 ly | 189 214 610 000 000 |
| 25 ly | 236 518 260 000 000 |
| 50 ly | 473 036 520 000 000 |
| 100 ly | 946 073 050 000 000 |
| 250 ly | 2 365 182 600 000 000 |
| 500 ly | 4 730 365 200 000 000 |
| 1000 ly | 9 460 730 500 000 000 |
Frequently asked
How many light-years are in a kilometer?
One kilometer equals 1.057000834e-13 light-years (km → ly). That figure is exact, not rounded.
How do you convert kilometers to light-years?
Multiply the number of kilometers by 0.000000000000105700083402 to get light-years.
What is 1 ly in kilometers?
One light-year is 9460730473000 kilometers.
What is 10 km in ly?
10 km = 1.0570008e-12 ly.
What exactly is a light-year?
Light travelling for one Julian year (365.25 days) in vacuum — exact, since both inputs are defined values.