Light Years to Miles Converter
Convert light-years (ly) to miles (mi) instantly. Type a value — the result updates as you type, and the swap button converts the other way.
Light Years to Miles formula
mi = ly × 5878625373183.61
1 light-year = 5878625373180 miles · 1 mile = 0 light-years
To convert light-years to miles, multiply the value by 5878625373183.61. For example, 1 ly:
mi = 1 × 5878625373183.61mi = 5878625373180
So 1 ly = 5878625373180 mi.
Mental math shortcut
Quick mental estimate: multiply by 5.9 trillion. For 1 ly that gives about 5900000000000 mi — within 1% of the exact answer. Use the exact formula when precision matters.
Light Years to Miles conversion table
Miles back to Light Years
The same values converted the other way, rounded for everyday use:
| Miles | Light-years |
|---|---|
| 2939312686590 mi | 0.5 ly |
| 5878625373180 mi | 1 ly |
| 24925371582300 mi | 4.24 ly |
| 50556178209400 mi | 8.6 ly |
| 58786253731800 mi | 10 ly |
| 587862537318000 mi | 100 ly |
| 5878625373180000 mi | 1000 ly |
About the units
Light-years (ly)
A light-year is the distance light travels in one Julian year: about 9.46 trillion kilometers or 5.88 trillion miles. It measures distances between stars.
Miles (mi)
A mile is 5,280 feet, or exactly 1,609.344 meters. It is the road-distance unit in the US and UK.
Frequently asked questions
How many miles are in a light-year?
One light-year equals 5878625373180 miles.
What is 1 Light Years in Miles?
1 ly = 5878625373180 mi.
How do I convert Miles back to Light Years?
Divide the miles by 5878625373183.61.