How many light years are in a foot?

There are 3.221739e-17 light years in 1 foot. The formula is ly = ft ÷ 31,039,141,970,000,000.

How do you convert feet to light years?

Use the formula ly = ft ÷ 31,039,141,970,000,000. For example, 10 feet equals 3.221739e-16 light years.

Is the feet to light years conversion exact?

Yes. Feet and light years are both units of length, related by an exact defined factor. Displayed results are rounded for readability.

What is ft short for?

ft is the standard symbol for foot (also written as ft). ly is the symbol for light year.

Convert Feet to light years

1 foot = 3.221739e-17 light years · ly = ft ÷ 31,039,141,970,000,000

Feet

Light years

3.221739e-17ly

1 foot = 3.221739e-17 light years

When you need this conversion

This conversion goes from feet, the US customary unit for height, rooms, and building dimensions, to light years, the astronomical distance light travels in a year. Both measure the same physical quantity, so the conversion is exact — the difference is which unit your source, tool, or region happens to use.

Feet to light years conversion table

Conversion table from feet to light years
Feet (ft)	Light years (ly)
1 ft	3.221739e-17 ly
2 ft	6.443477e-17 ly
3 ft	9.665216e-17 ly
5 ft	1.610869e-16 ly
10 ft	3.221739e-16 ly
15 ft	4.832608e-16 ly
20 ft	6.443477e-16 ly
25 ft	8.054346e-16 ly
50 ft	1.610869e-15 ly
75 ft	2.416304e-15 ly
100 ft	3.221739e-15 ly
250 ft	8.054346e-15 ly
500 ft	1.610869e-14 ly
1,000 ft	3.221739e-14 ly

The formula

ly = ft ÷ 31,039,141,970,000,000

Because 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

Light years to feet →

Related length conversions

All length conversions →

Frequently asked questions

How many light years are in a foot?: There are 3.221739e-17 light years in 1 foot. The formula is ly = ft ÷ 31,039,141,970,000,000.
How do you convert feet to light years?: Use the formula ly = ft ÷ 31,039,141,970,000,000. For example, 10 feet equals 3.221739e-16 light years.
Is the feet to light years conversion exact?: Yes. Feet and light years are both units of length, related by an exact defined factor. Displayed results are rounded for readability.
What is ft short for?: ft is the standard symbol for foot (also written as ft). ly is the symbol for light year.