Convert Light Years to Millimeters
1 light year = 9.460730e+18 millimeters. Type any value below to convert in either direction — the calculation happens in your browser.
Light Years to Millimeters formula
Multiply the number of light years by 9.460730e+18 to get millimeters.
millimeters = light years × 9.460730e+18To go the other way: divide the number of millimeters by 9.460730e+18, or multiply by 1.057001e-19.
light years = millimeters ÷ 9.460730e+18Light Years to Millimeters conversion table
| Light Years | Millimeters |
|---|---|
| 1 ly | 9.460730e+18 mm |
| 2 ly | 1.892146e+19 mm |
| 3 ly | 2.838219e+19 mm |
| 4 ly | 3.784292e+19 mm |
| 5 ly | 4.730365e+19 mm |
| 6 ly | 5.676438e+19 mm |
| 7 ly | 6.622511e+19 mm |
| 8 ly | 7.568584e+19 mm |
| 9 ly | 8.514657e+19 mm |
| 10 ly | 9.460730e+19 mm |
| 15 ly | 1.419110e+20 mm |
| 20 ly | 1.892146e+20 mm |
| 25 ly | 2.365183e+20 mm |
| 30 ly | 2.838219e+20 mm |
| 40 ly | 3.784292e+20 mm |
| 50 ly | 4.730365e+20 mm |
| 75 ly | 7.095548e+20 mm |
| 100 ly | 9.460730e+20 mm |
| 250 ly | 2.365183e+21 mm |
| 500 ly | 4.730365e+21 mm |
| 1,000 ly | 9.460730e+21 mm |
Millimeters to Light Years conversion table
| Millimeters | Light Years |
|---|---|
| 1 mm | 1.057001e-19 ly |
| 2 mm | 2.114002e-19 ly |
| 3 mm | 3.171003e-19 ly |
| 4 mm | 4.228003e-19 ly |
| 5 mm | 5.285004e-19 ly |
| 6 mm | 6.342005e-19 ly |
| 7 mm | 7.399006e-19 ly |
| 8 mm | 8.456007e-19 ly |
| 9 mm | 9.513008e-19 ly |
| 10 mm | 1.057001e-18 ly |
About the light year
A light year is the distance light travels in one Julian year, about 9.46 trillion kilometres.
About the millimeter
A millimetre is one thousandth of a metre and is the default unit on engineering drawings and rulers.
Frequently asked questions
How many millimeters are in a light year?
There are 9.460730e+18 millimeters in one light year.
How many light years are in a millimeter?
There are 1.057001e-19 light years in one millimeter.
Is this conversion exact?
The ratio between the light year and the millimeter is fixed by definition, so the conversion is exact — the figures shown here are rounded for readability only.
What is 10 light years in millimeters?
10 light years equals 9.460730e+19 millimeters.
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