Convert feet to light years

1 ft=3.2217e-17ly

Use the converter below to change any feet value into light years instantly — with formula, conversion table, and real-world examples.

You have

Equals

3.2217e-17

Conversion formula

Forward

light years = feet × 3.2217e-17

Reverse

feet = light years × 3.1039e16

Example: 10 ft × 3.2217e-17 = 3.2217e-16 ly.

About both units

From

Foot

The foot equals 30.48 centimeters exactly and is one of the oldest length units in human history. It is the international aviation standard for altitude — commercial airliners cruise at 35,000 feet. In the US, building dimensions, human height and elevation are all expressed in feet. 1 foot = 12 inches.

Real-world: Airliners cruise at 35,000 ft (10.7 km). Mount Everest is 29,032 ft (8,849 m). A standard US ceiling is 8 ft (2.44 m).

Read full foot reference →

Light Year

A light year is the distance light travels in one Julian year — approximately 9.461 × 10¹⁵ meters, or 63,241 AU. It is used in astronomy to describe distances between stars and galaxies. The nearest star to the Sun, Proxima Centauri, is 4.24 light years away.

Real-world: Proxima Centauri, the nearest star beyond the Sun, is 4.24 ly away. The Milky Way is about 100,000 ly across.

Read full light year reference →

Foot to Light Year conversion table

Common feet to light years values for quick reference.

Foot (ft)	Light Year (ly)
1 ft	3.2217e-17 ly
5 ft	1.6109e-16 ly
10 ft	3.2217e-16 ly
25 ft	8.0544e-16 ly
50 ft	1.6109e-15 ly
100 ft	3.2217e-15 ly
250 ft	8.0544e-15 ly
500 ft	1.6109e-14 ly
1,000 ft	3.2217e-14 ly
5,000 ft	1.6109e-13 ly

Tips & common mistakes

Quick tips

1 foot = 12 inches = 30.48 cm exactly. Knowing feet gives you inches instantly.
For a quick metric estimate, multiply feet by 0.3 — 10 ft ≈ 3 m.
Pilots and air-traffic control use feet globally, even over metric countries.

Avoid these

Writing "6.2 ft" to mean "6 feet 2 inches" — the decimal form is 6.167 ft, not 6.2.
Confusing feet (length) with square feet (area) in US real-estate listings.
Using 0.3 instead of 0.3048 on structural drawings — errors accumulate on multi-storey buildings.

Frequently asked questions

How many light years in a foot?

One foot equals 3.2217e-17 light years.

How do I convert feet to light years?

Multiply the foot value by 3.2217e-17 to get the equivalent in light years.

What is 100 feet in light years?

100 feet equals 3.2217e-15 light years.

Is a foot bigger than a light year?

No. 1 foot equals 3.2217e-17 light years, so one foot is smaller.

How to convert feet to light years without a calculator?

Multiply by 0 for a quick estimate; use a calculator for precise results.

Related length conversions

📊 See full comparison matrix →

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