Mile to Light Year Conversion Calculator: Free Online Tool
Convert miles to light years with our free online length converter.
Mile to Light Year Calculator
How to Use the Calculator:
- Enter the value you want to convert in the 'From' field (Mile).
- The converted value in Light Year will appear automatically in the 'To' field.
- Use the dropdown menus to select different units within the Length category.
- Click the swap button (⇌) to reverse the conversion direction.
How to Convert Mile to Light Year
Converting Mile to Light Year involves multiplying the value by a specific conversion factor, as shown in the formula below.
Formula:
1 Mile = 1.7010e-13 light yearsExample Calculation:
Convert 10 miles: 10 × 1.7010e-13 = 1.7010e-12 light years
Disclaimer: For Reference Only
These conversion results are provided for informational purposes only. While we strive for accuracy, we make no guarantees regarding the precision of these results, especially for conversions involving extremely large or small numbers which may be subject to the inherent limitations of standard computer floating-point arithmetic.
Not for professional use. Results should be verified before use in any critical application. View our Terms of Service for more information.
What is a Mile and a Light Year?
The mile, specifically the international statute mile, is a unit of length in the British imperial and United States customary systems. It is defined as exactly 5,280 feet, 1,760 yards, or approximately 1.609344 kilometers.
A light-year is a unit of astronomical distance equal to the distance that light travels in one Julian year in a vacuum (approximately 9.461 trillion kilometers or 5.879 trillion miles).
Note: The Mile is part of the imperial/US customary system, primarily used in the US, UK, and Canada for everyday measurements. The Light Year belongs to the imperial/US customary system.
History of the Mile and Light Year
The mile originated from the Roman "mille passus", meaning "thousand paces" (where a pace was two steps). Its length varied considerably until Queen Elizabeth I of England standardized it as 5,280 feet in 1593. The international mile agreement of 1959 confirmed its definition based on the metric system.
The concept was first used by Friedrich Bessel in 1838 when measuring the distance to the star 61 Cygni.
Common Uses for miles and light years
Explore the typical applications for both Mile (imperial/US) and Light Year (imperial/US) to understand their common contexts.
Common Uses for miles
- Geography & Travel (US/UK): Measuring geographic distances and road lengths in the US, UK, and some other countries.
- Transportation (US/UK): Road speed limits (miles per hour, mph) in the US and UK.
- Maritime & Aviation: Nautical and aviation use a related unit, the nautical mile (approx. 1.852 km).
- Athletics: Running events (e.g., the mile run).
Common Uses for light years
- Measuring distances to stars and galaxies
- Expressing the vast scale of the universe in astronomy
Frequently Asked Questions
Questions About Mile (mi)
How many feet are in a mile?
There are exactly 5,280 feet (ft) in 1 mile (mi).
How many yards are in a mile?
There are exactly 1,760 yards (yd) in 1 mile (mi).
Is a mile longer or shorter than a kilometer?
A mile (approx. 1.609 km) is longer than a kilometer (1 km).
About Light Year (ly)
Is a light-year a unit of time or distance?
A light-year (ly) is a unit of distance, not time. It represents the distance light travels in one year.
How far is a light-year in kilometers and miles?
One light-year is approximately 9.461 trillion kilometers (9.461 x 10^12 km) or 5.879 trillion miles (5.879 x 10^12 mi).
What is the closest star to Earth in light-years?
Excluding the Sun, the closest star system to Earth is Alpha Centauri, which is about 4.37 light-years away.
Conversion Table: Mile to Light Year
| Mile (mi) | Light Year (ly) |
|---|---|
| 1 | 0 |
| 5 | 0 |
| 10 | 0 |
| 25 | 0 |
| 50 | 0 |
| 100 | 0 |
| 500 | 0 |
| 1,000 | 0 |