# Furlongs to Astronomical Units (fur to au)

Source: https://www.unitconvertercalculator.com/length/furlongs-to-astronomical-units/

**1 fur = 1.3447250222125E-9 au**

One furlong equals approximately 1.345 x 10-9 astronomical units, or about 1.3 billionths of an AU. The furlong (220 yards / 201.168 m) is an agricultural and horse racing unit; the AU measures the Earth-Sun distance. About 743 million furlongs fit into one AU.

## Formula

Convert Furlongs to Astronomical Units

## Conversion Table

| Furlongs (fur) | Astronomical Units (au) |
|---|---|
| 1 fur | 1.34472502221E-9 au |
| 10 fur | 1.344725022212E-8 au |
| 100 fur | 1.3447250222124E-7 au |
| 1000 fur | 1.3447250222125E-6 au |
| 10000 fur | 1.3447250222125E-5 au |
| 100000 fur | 0.00013447250222125 au |
| 1000000 fur | 0.0013447250222125 au |
| 10000000 fur | 0.013447250222125 au |

## 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.

### Astronomical Unit (au)

Exactly 149,597,870,700 meters by IAU 2012 definition. Roughly the average distance from the Earth to the Sun. Used for distances within our solar system.

## Background

The Earth-Sun distance (1 AU) is about 743 million furlongs. A Kentucky Derby (10 furlongs) covers 1.345 x 10-8 AU. The entire length of Britain (about 4,800 furlongs) is only 0.00000646 AU. These numbers show how small even large earthly distances are on the astronomical scale.

## Good to Know

The furlong was designed for an ox. The AU was designed for planets. The gap between their scales reflects the gap between pre-industrial agriculture and modern astrophysics.

## FAQ

### How many AU is 1 furlong?

One furlong equals approximately 1.345 x 10-9 AU (about 1.3 billionths of an AU).

### How many furlongs are in 1 AU?

One AU contains approximately 7.432 x 108 furlongs (about 743 million).

### Is this conversion practical?

No. Furlongs measure horse races and historical farmland. AU measures planetary orbits. These are about 9 orders of magnitude apart.

## Non-Frequently Asked Questions

### How many horse races to the Sun?

The Sun is 1 AU = about 7.432 x 108 furlongs away. A 6-furlong race means about 1.24 x 108 races (124 million) to cover the distance. At one race every 72 seconds, running continuously, it would take about 283 years of non-stop racing.

### Is the Kentucky Derby measurable in AU?

The Kentucky Derby is 10 furlongs = about 1.346 x 10-8 AU (about 13 billionths of an AU). The entire Derby is less than one hundred-millionth of the distance to the Sun. From a cosmic perspective, horse racing is immeasurably local.

### If horses could race in space, how long is an AU in furlongs?

One AU is about 743,200,000 furlongs. At a derby pace of about 17 seconds per furlong, racing 1 AU would take about 400 years of continuous galloping. Space horse racing needs significantly faster horses. Or wormholes.

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## See Also

- [Astronomical Units to Furlongs](https://www.unitconvertercalculator.com/length/astronomical-units-to-furlongs/)