Convert Feet (ft) to Light Years (ly) | ft in ly

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# Let's convert Feet (ft) to Light Years (ly)

This quick and easy calculator will convert Feet (ft) to Light Years (ly) and show formula, brief history on the units and quick maths for the conversion.

## Quick Reference for Converting Feet to Light Years

Formula
ly = ft / 3.1038549868766E+16
Quick Rough Maths
To get the Light Years, divide the number of Feet by 31038.5 trillion
Feet (ft) in 1 Light Year
There are 3.1038549868766E+16 Feet in 1 Light Year
Light Years (ly) in 1 Foot
There are 0 Light Years in 1 Foot

## Unit Information

Foot
/fʊt/
Symbol: ft
Unit System: Imperial

### What is the Foot?

The foot is a unit of length in the imperial unit system and uses the symbol ft.

One foot is exactly equal to 12 inches. It is also exactly equal to 0.3048m. One yard is comprised of three feet.

The foot is just behind the metre in terms of widespread use due to its previous popularity. The US is the only developed country that still uses the foot in preference to the metre.

The UK still uses feet to express human height more than metres.

Light Year
/lʌɪt jɪə,jəː/
Symbol: ly
Unit System: Astronomical System of Units

### What is the Light Year?

The light year is a unit of length in the Astronomical system of units. It uses the symbol ly.

Often confused with a unit of time as it contains the word "year", it is actually defined by the International Astronomical Union (IAU) as the amount of distance that light travels in a vacuum in one Julian year (365.25 days).

Using the speed of light (299,792,458 m/s or 'c') and the Julian year (as apposed to the Gregorian year which is 365.2425 days), we can equivalate 1 light year as 9,460,730,472,580,800 metres or ≈ 9.46 trillion kilometres.