Convert Light Year to Foot
Use this free converter to change light years (ly) into feet (ft). Light year and foot both measure length. As a quick reference, 1 ly equals 3.1039e+16 ft, and 1 ft equals 3.2217e-17 ly.
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Foot (ft)
3.1039e+16
1 ly = 3.1039e+16 ft
Length conversion table
| Light Year | Foot |
|---|---|
| 0.01 | 3.1039e+14 |
| 0.1 | 3.1039e+15 |
| 0.5 | 1.5520e+16 |
| 1 | 3.1039e+16 |
| 2 | 6.2078e+16 |
| 3 | 9.3117e+16 |
| 5 | 1.5520e+17 |
| 10 | 3.1039e+17 |
| 20 | 6.2078e+17 |
| 25 | 7.7598e+17 |
| 50 | 1.5520e+18 |
| 100 | 3.1039e+18 |
| 1,000 | 3.1039e+19 |
How to convert Light Year to Foot
Multiply the light year value by 3.1039e+16 to get feet.
- Enter the number of light years you want to convert.
- The converter instantly shows the equivalent value in feet.
- Worked example: 15 ly × 3.1039e+16 = 4.6559e+17 ft.
- Use the swap button to reverse the conversion (foot to light year).
About these units
Light Year (ly)
- Definition
- A light-year (ly) is the distance light travels in one year in a vacuum, about 9.46 trillion kilometers.
- History
- The concept arose in the 19th century as astronomers sought an intuitive way to express the vast distances between stars.
- Current use
- Light-years express distances to stars and galaxies in astronomy and popular science.
Foot (ft)
- Definition
- A foot (ft) is an imperial unit of length equal to 12 inches or exactly 0.3048 meters.
- History
- Derived from the human foot, it varied across regions until the international foot was defined in 1959.
- Current use
- Feet are widely used for height, room dimensions, and aviation altitude, especially in the US and UK.
Frequently asked questions
How many feet are in a light year?
There are 3.1039e+16 ft in 1 ly. To convert, multiply the number of light years by 3.1039e+16.
How do I convert light years to feet?
Multiply the light year value by 3.1039e+16 to get feet. For example, 10 ly = 3.1039e+17 ft.
Is this light year-to-foot converter free?
Yes. This converter is completely free, runs entirely in your browser, and requires no sign-up. Your inputs never leave your device.
Convert Light Year to other length units
| Unit | 1 Light Year equals |
|---|---|
| Meter (m) | 9.4607e+15 m |
| Kilometer (km) | 9.4607e+12 km |
| Centimeter (cm) | 9.4607e+17 cm |
| Millimeter (mm) | 9.4607e+18 mm |
| Micrometer (µm) | 9.4607e+21 µm |
| Nanometer (nm) | 9.4607e+24 nm |
| Mile (mi) | 5.8786e+12 mi |
| Yard (yd) | 1.0346e+16 yd |
| Foot (ft) | 3.1039e+16 ft |
| Inch (in) | 3.7247e+17 in |
| Nautical Mile (nmi) | 5.1084e+12 nmi |