Convert Light years to feet
1 light year = 3.103914e16 feet · ft = ly × 31,039,141,970,000,000
When you need this conversion
This conversion goes from light years, the astronomical distance light travels in a year, to feet, the US customary unit for height, rooms, and building dimensions. Both measure the same physical quantity, so the conversion is exact — the difference is which unit your source, tool, or region happens to use.
Light years to feet conversion table
| Light years (ly) | Feet (ft) |
|---|---|
| 1 ly | 3.103914e16 ft |
| 2 ly | 6.207828e16 ft |
| 3 ly | 9.311743e16 ft |
| 5 ly | 1.551957e17 ft |
| 10 ly | 3.103914e17 ft |
| 15 ly | 4.655871e17 ft |
| 20 ly | 6.207828e17 ft |
| 25 ly | 7.759785e17 ft |
| 50 ly | 1.551957e18 ft |
| 75 ly | 2.327936e18 ft |
| 100 ly | 3.103914e18 ft |
| 250 ly | 7.759785e18 ft |
| 500 ly | 1.551957e19 ft |
| 1,000 ly | 3.103914e19 ft |
The formula
ft = ly × 31,039,141,970,000,000Because both units measure length, the conversion is a single multiplication by a fixed factor. That factor never changes, so the result is exact.
Convert the other way
Feet to light years →Related length conversions
- Centimeters to feet
- Yards to feet
- Millimeters to micrometers
- Centimeters to inches
- Meters to kilometers
- Kilometers to meters
- Inches to centimeters
- Feet to centimeters
- Feet to yards
- Micrometers to millimeters
- Millimeters to feet
- Meters to feet
Frequently asked questions
- How many feet are in a light year?
- There are 3.103914e16 feet in 1 light year. The formula is ft = ly × 31,039,141,970,000,000.
- How do you convert light years to feet?
- Use the formula ft = ly × 31,039,141,970,000,000. For example, 10 light years equals 3.103914e17 feet.
- Is the light years to feet conversion exact?
- Yes. Light years and feet are both units of length, related by an exact defined factor. Displayed results are rounded for readability.
- What is ly short for?
- ly is the standard symbol for light year. ft is the symbol for foot.