# Astronomical Units to Furlongs (au to fur)

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

**1 au = 743646458.1842 fur**

One astronomical unit equals approximately 7.432 x 108 furlongs, or about 743 million furlongs. This conversion pairs the solar system distance unit with the horse racing and agricultural unit (220 yards / 201.168 m). The Kentucky Derby at 10 furlongs covers 0.00000000135 AU, illustrating the enormous scale difference.

## Formula

Convert Astronomical Units to Furlongs

## Conversion Table

| Astronomical Units (au) | Furlongs (fur) |
|---|---|
| 1.0E-9 au | 0.7436464581842 fur |
| 1.0E-8 au | 7.436464581842 fur |
| 1.0E-7 au | 74.36464581842 fur |
| 1.0E-6 au | 743.6464581842 fur |
| 1.0E-5 au | 7436.464581842 fur |
| 0.0001 au | 74364.64581842 fur |
| 0.001 au | 743646.4581842 fur |
| 0.01 au | 7436464.581842 fur |
| 0.1 au | 74364645.81842 fur |
| 0.39 au | 290022118.69184 fur |
| 0.72 au | 535425449.89263 fur |
| 1 au | 743646458.1842 fur |
| 1.52 au | 1130342616.44 fur |
| 5.2 au | 3866961582.5579 fur |

## Units

### 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.

### 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.

## Background

The Earth-Sun distance of 1 AU would be about 743 million Kentucky Derbys placed end to end. A furlong, the distance an ox could plough without rest, is incomprehensibly small compared to planetary orbits. This conversion exists only for mathematical completeness.

## Good to Know

The furlong survives in horse racing, while the AU thrives in planetary science. Both units are niche specialists in their own domains, making their combination one of the quirkiest pairings in unit conversion.

## FAQ

### How many furlongs are in 1 AU?

One AU contains approximately 7.432 x 108 furlongs (about 743 million). Since 1 AU = 149,597,870,700 meters and 1 furlong = 201.168 meters, divide the former by the latter.

### How far is 1 furlong in AU?

One furlong is approximately 1.345 x 10-9 AU, or about 1.3 billionths of an AU. A furlong is vanishingly small on the astronomical scale.

### Is this conversion practical?

No. Furlongs are used in horse racing and some British road signs. AU measures planetary distances. These fields have no overlap whatsoever.

## Non-Frequently Asked Questions

### How many Kentucky Derbys fit between Earth and the Sun?

The Earth-Sun distance is about 743 million furlongs. The Kentucky Derby is 10 furlongs. So about 74.3 million Kentucky Derbys fit between us and the Sun. That is a lot of horse races.

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## See Also

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