Lightyears to Millimeters

Bookmark Page Millimeters to Lightyears (Swap Units)


Note: Fractional results are rounded to the nearest 1/64. For a more accurate answer please select 'decimal' from the options above the result.

Note: You can increase or decrease the accuracy of this answer by selecting the number of significant figures required from the options above the result.

Note: For a pure decimal result please select 'decimal' from the options above the result.

Show formula

Convert Lightyears to Millimeters

mm =
Show working
Show result in exponential format
More information: Millimeters


A lightyear is the distance that light travels in one year. Since there are various definitions for the length of a year, there are correspondingly slightly different values for a lightyear. One lightyear corresponds to about 9.461e15 m, 5.879e12 mi, or 63239.7 AU, or 0.3066 pc.


Convert Lightyears to Millimeters

mm =


The millimetre is a unit of length in the metric system, equivalent to one thousandth of a metre (the SI base unit of length).

One meter was defined in 1983 by the 17th conference of weights and measures as “the length of the path travelled by light in vacuum during a time interval of 1/299 792 458 of a second” and the millimetre by definition is derived as being 1/1000th of that value.


Lightyears to Millimeters table
Print table
< Smaller Values Larger Values >
Lightyears Millimeters
0ly 0.00mm
1ly 9460730777119563776.00mm
2ly 18921461554239127552.00mm
3ly 28382192331358691328.00mm
4ly 37842923108478255104.00mm
5ly 47303653885597818880.00mm
6ly 56764384662717382656.00mm
7ly 66225115439836946432.00mm
8ly 75685846216956510208.00mm
9ly 85146576994076065792.00mm
10ly 94607307771195637760.00mm
11ly 104068038548315209728.00mm
12ly 113528769325434765312.00mm
13ly 122989500102554320896.00mm
14ly 132450230879673892864.00mm
15ly 141910961656793464832.00mm
16ly 151371692433913020416.00mm
17ly 160832423211032576000.00mm
18ly 170293153988152131584.00mm
19ly 179753884765271719936.00mm
Lightyears Millimeters
20ly 189214615542391275520.00mm
21ly 198675346319510831104.00mm
22ly 208136077096630419456.00mm
23ly 217596807873749975040.00mm
24ly 227057538650869530624.00mm
25ly 236518269427989086208.00mm
26ly 245979000205108641792.00mm
27ly 255439730982228230144.00mm
28ly 264900461759347785728.00mm
29ly 274361192536467341312.00mm
30ly 283821923313586929664.00mm
31ly 293282654090706485248.00mm
32ly 302743384867826040832.00mm
33ly 312204115644945596416.00mm
34ly 321664846422065152000.00mm
35ly 331125577199184707584.00mm
36ly 340586307976304263168.00mm
37ly 350047038753423884288.00mm
38ly 359507769530543439872.00mm
39ly 368968500307662995456.00mm
Lightyears Millimeters
40ly 378429231084782551040.00mm
41ly 387889961861902106624.00mm
42ly 397350692639021662208.00mm
43ly 406811423416141217792.00mm
44ly 416272154193260838912.00mm
45ly 425732884970380394496.00mm
46ly 435193615747499950080.00mm
47ly 444654346524619505664.00mm
48ly 454115077301739061248.00mm
49ly 463575808078858616832.00mm
50ly 473036538855978172416.00mm
51ly 482497269633097728000.00mm
52ly 491958000410217283584.00mm
53ly 501418731187336904704.00mm
54ly 510879461964456460288.00mm
55ly 520340192741576015872.00mm
56ly 529800923518695571456.00mm
57ly 539261654295815127040.00mm
58ly 548722385072934682624.00mm
59ly 558183115850054238208.00mm
Metric Conversion Table iPhone & Android app Length Currency Temperature Weight Area Volume Speed Time Angle Pressure Energy and Power Health and Wellbeing