# Light-years to Feet (ly to ft)

Source: https://www.unitconvertercalculator.com/length/light-years-to-feet/

**1 ly = 3.1039141970409E+16 ft**

One light-year equals approximately 3.104 x 1016 feet (about 31 quadrillion). The light-year measures interstellar space; the foot measures human height and construction. Light travels about 983.6 million feet per second.

## Formula

Convert Light-years to Feet

## Conversion Table

| Light-years (ly) | Feet (ft) |
|---|---|
| 1.0E-16 ly | 3.1039141970409 ft |
| 1.0E-15 ly | 31.039141970409 ft |
| 1.0E-14 ly | 310.39141970409 ft |
| 1.0E-13 ly | 3103.9141970409 ft |
| 1.0E-12 ly | 31039.141970409 ft |
| 1.0E-11 ly | 310391.41970409 ft |
| 1.0E-10 ly | 3103914.1970409 ft |
| 1.0E-9 ly | 31039141.970409 ft |
| 1.0E-8 ly | 310391419.70409 ft |
| 1.0E-7 ly | 3103914197.0409 ft |
| 1.0E-6 ly | 31039141970.409 ft |

## Units

### Light-year (ly)

The distance light travels in one Julian year (365.25 days) in vacuum. Exactly 9,460,730,472,580,800 meters. Used for interstellar distances.

### Foot (ft)

An imperial unit of length equal to 12 inches or 0.3048 meters. Used in the US and UK for height, altitude, and construction.

## Background

Proxima Centauri at 4.24 light-years is about 1.316 x 1017 feet away. A 6-foot person is 1.932 x 10-16 light-years tall. Light covers about 983.6 million feet per second, which sounds impossibly fast in any unit.

## Good to Know

The foot was defined by a king. The light-year was defined by physics. One is a human artifact; the other is a cosmic constant. Yet both measure the same dimension: length. The universe does not care which unit you use.

## FAQ

### How many feet are in 1 light-year?

One light-year contains approximately 3.104 x 1016 feet (about 31 quadrillion).

### How fast does light travel in feet per second?

Light travels approximately 983,571,056 feet per second (299,792 km/s).

### Is this conversion useful?

Only for dramatic scale. Saying 'light moves a billion feet per second' makes its speed viscerally comprehensible.

## Non-Frequently Asked Questions

### How many footsteps to the nearest star?

At 2.5 feet per step, walking to Proxima Centauri (1.316 x 1017 feet) requires about 5.27 x 1016 steps. Your fitness tracker would overflow several times.

### How tall is the tallest building in light-years?

The Burj Khalifa is 2,717 feet = 8.75 x 10-14 light-years. To be 1 light-year tall, a building would need 11.4 billion Burj Khalifas stacked. Structural engineering has limits.

### If I grew 1 foot per year, how long until I am 1 light-year tall?

3.104 x 1016 years. The universe is 1.38 x 1010 years old. You would need 2.25 million universe lifetimes. Growth hormone would not help.

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## See Also

- [Feet to Light-years](https://www.unitconvertercalculator.com/length/feet-to-light-years/)