# Furlongs to Light-years (fur to ly)

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

**1 fur = 2.1263474377906E-14 ly**

One furlong equals approximately 2.127 x 10-14 light-years. A light-year contains about 4.702 x 1013 furlongs (47 trillion). The furlong measures horse racing distances; the light-year measures interstellar voids. These units have never intersected and never will.

## Formula

Convert Furlongs to Light-years

## Conversion Table

| Furlongs (fur) | Light-years (ly) |
|---|---|
| 1 fur | 2.126347E-14 ly |
| 100 fur | 2.12634743E-12 ly |
| 10000 fur | 2.1263474377E-10 ly |
| 1000000 fur | 2.12634743779E-8 ly |
| 100000000 fur | 2.1263474377906E-6 ly |
| 10000000000 fur | 0.00021263474377906 ly |
| 1000000000000 fur | 0.021263474377906 ly |
| 100000000000000 fur | 2.1263474377906 ly |

## Units

### Furlong (fur)

Exactly 660 feet or one-eighth of a mile (201.168 m). Originally the length of a plowed furrow. Still used in horse racing.

### 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.

## Background

The nearest star at 4.24 light-years is about 2 x 1014 furlongs away. The Kentucky Derby (10 furlongs) covers 2.13 x 10-13 light-years. Even running 47 trillion Kentucky Derbys back-to-back would only cover 1 light-year.

## Good to Know

Furlongs per fortnight is a humorous unit of speed sometimes used in physics classes (about 0.000166 m/s). The furlong-to-light-year conversion is equally whimsical, pairing ox-plowing with starlight.

## FAQ

### How many light-years is 1 furlong?

One furlong equals approximately 2.127 x 10-14 light-years.

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

One light-year contains approximately 4.702 x 1013 furlongs (about 47 trillion).

### Is this conversion ever used?

Never. These units serve completely unrelated measurement domains separated by 14 orders of magnitude.

## Non-Frequently Asked Questions

### How many furlongs per second is the speed of light?

Light travels at about 1,489,500 furlongs per second. That is roughly 1.5 million furlongs per second. A horse covers 1 furlong in 12 seconds. Light covers 1.5 million furlongs in 1 second. The speed difference is about 18 million to 1. Light wins every race.

### If a horse ran at the speed of light, how long is a light-furlong?

A light-furlong is the time light takes to travel 1 furlong: about 6.71 x 10-7 seconds (671 nanoseconds). In that time, a computer processor executes about 2,000 operations. Your computer finishes homework faster than light finishes a furlong.

### How many Derby races to reach a star?

A 10-furlong Derby covers 2,011.68 m. A light-year is 9.461 x 1015 m. So about 4.7 x 1012 Derbies (4.7 trillion) equal 1 light-year. The nearest star at 4.24 light-years would need about 20 trillion Derby distances. Prize money would be considerable.

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## See Also

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