To convert feet to light years, multiply by 3.221738542e-17.
The calculation uses 1 ft = 3.221738542e-17 ly. Results are displayed to at most 10 significant digits. Definitions can be exact while a displayed decimal is rounded. Match the displayed precision to your original measurement.
The formula
value in ly = value in ft × 3.221738542e-17
ft- Input unit: feet
ly- Output unit: light years
How to use this calculator
- Enter a value in ft.
- Multiply by the stored conversion factor.
- Read the result in ly; divide by the same factor to convert back.
Worked examples
Worked conversion
1 ft × 3.221738542e-17 ≈ 3.221738542e-17 ly.
Reverse conversion
3.221738542e-17 ly ÷ 3.221738542e-17 ≈ 1 ft. Rounding intermediate values can change the last displayed digit.
Frequently asked questions
What factor does this converter use?
It uses 3.221738542e-17 ly per ft.
Why can another converter show a slightly different answer?
Check the unit convention first (such as US versus Imperial or decimal versus binary), then compare rounding. Measurement uncertainty is separate from the unit conversion.
ft to ly table
| ft | ly (rounded) |
|---|---|
| 0 | 0 |
| 1 | 3.221738542e-17 |
| 2 | 6.443477084e-17 |
| 5 | 1.610869271e-16 |
| 10 | 3.221738542e-16 |
| 100 | 3.221738542e-15 |
Related calculators
Light-Years to Feet ConverterTo convert light years to feet, multiply by 31039141970000000.Yards to Millimeters ConverterTo convert yards to mm, multiply by 914.4.Feet to Mils ConverterTo convert feet to mils, multiply by 12000.Yards to Centimeters ConverterTo convert yards to cm, multiply by 91.44.Feet to Nanometers ConverterTo convert feet to nanometers, multiply by 304800000.Square Miles to Square Millimeters ConverterTo convert square miles to square millimeters, multiply by 2589988110000.