18 Furlong to Astronomical Unit
Quick answer
18 Furlong (fur) equals
2.420505e-8 AU
To convert 18 Furlongs to Astronomical Units, multiply by 1.344725e-9. Therefore, 18 Furlong (fur) equals 2.420505e-8 Astronomical Unit (AU).
Formula: AU = fur × 1.344725e-9. Calculation: 18 × 1.344725e-9 = 2.420505e-8 AU.
Convert Furlong (fur) to Astronomical Unit (AU) online with our free unit converter. In length, 1 fur = 1.344725e-9 AU. Explore step-by-step conversion steps, mathematical formulas, and quick conversion reference tables below.
Worked example: converting Furlong to Astronomical Unit
- Step 1 — start with the formula. AU = fur × 1.344725e-9
- Step 2 — substitute your figure. 18 fur × 1.344725e-9
- Step 3 — read the result. 18 fur = 2.420505e-8 AU
- Step 4 — check it in reverse. fur = AU × 743,646,458.1842042 returns 18 fur, which matches the figure you started with.
Length Converter
31 units available
18 fur = 2.420505e-8 AU
Formula:
AU = fur × 1.344725e-9With your value: 18 fur = 2.420505e-8 AU
How big is that?
Everyday references on a logarithmic scale, all expressed in furlong so you can sanity-check the result.
Other Furlong to Astronomical Unit conversions
Furlong to Astronomical Unit Conversion Table
| Furlong (fur) | Astronomical Unit (AU) |
|---|---|
| 0.5 | 6.723625e-10 |
| 1 | 1.344725e-9 |
| 2 | 2.689450e-9 |
| 5 | 6.723625e-9 |
| 10 | 1.344725e-8 |
| 15 | 2.017088e-8 |
| 20 | 2.689450e-8 |
| 25 | 3.361813e-8 |
| 50 | 6.723625e-8 |
| 100 | 1.344725e-7 |
| 250 | 3.361813e-7 |
| 500 | 6.723625e-7 |
| 1000 | 1.344725e-6 |
Astronomical Unit to Furlong Conversion Table
| Astronomical Unit (AU) | Furlong (fur) |
|---|---|
| 0.5 | 371,823,229.092102 |
| 1 | 743,646,458.184204 |
| 2 | 1,487,292,916.368409 |
| 5 | 3,718,232,290.921021 |
| 10 | 7,436,464,581.842042 |
| 15 | 11,154,696,872.763063 |
| 20 | 14,872,929,163.684084 |
| 25 | 18,591,161,454.605106 |
| 50 | 37,182,322,909.21021 |
| 100 | 74,364,645,818.42043 |
| 250 | 185,911,614,546.05103 |
| 500 | 371,823,229,092.10205 |
| 1000 | 743,646,458,184.2041 |
Where these values come from
Every factor on this page is traced to the document that defines it. See the full provenance dataset or our methodology.
Furlong (fur)
Length
Traceable to the metre, defined by fixing the speed of light in vacuum at 299 792 458 m/s. Imperial lengths derive from the 1959 international yard (0.9144 m exactly).
Source: BIPM, The International System of Units (SI), 9th edition, 2019 (updated 2024)
Bureau International des Poids et Mesures · Reviewed 2026-07-01
Astronomical Unit (AU)
Length
The astronomical unit is exactly 149 597 870 700 m (IAU Resolution B2, 2012).
Source: IAU Resolution B2 (2012) — definition of the astronomical unit; IAU B2 (2015) nominal values
International Astronomical Union · Reviewed 2026-07-01
How to Convert Furlong to Astronomical Unit
To convert from Furlong (fur) to Astronomical Unit (AU), multiply the value by 1.344725e-9.
Formula: AU = fur × 1.344725e-9
Reverse: fur = AU × 743,646,458.1842042
Step-by-Step Example
- Start with your value in Furlong. For example: 5 fur
- Multiply by the conversion factor: 5 x 1.344725e-9
- The result is: 6.723625e-9 AU
Furlong and Astronomical Unit Relationship
This calculation facilitates standardized conversion between recognized units of length. Since 1 Furlong represents a fraction of a Astronomical Unit (1 Astronomical Unit ≈ 7.436e+8 Furlongs), the Astronomical Unit is the larger measurement interval. Understanding the relationship between Furlong and Astronomical Unit is essential for accurate calculations in physics, engineering, commerce, and daily applications.
About Furlong
The furlong equals 220 yards (201.168 m), one eighth of a mile. It survives almost exclusively in horse racing.
Common uses of Furlong: horse racing, historic land records.
About Astronomical Unit
The astronomical unit (AU) is defined as exactly 149,597,870,700 metres, close to the mean Earth–Sun distance. It is the natural yardstick for the Solar System.
Common uses of Astronomical Unit: planetary science, orbital mechanics, astronomy.
Frequently Asked Questions
- What is 18 Furlong in Astronomical Unit?
- 18 Furlong equals 2.420505e-8 Astronomical Unit.
- How many Astronomical Units are in 1 Furlong?
- There are exactly 1.344725e-9 Astronomical Units in 1 Furlong. This means the conversion factor from Furlong to Astronomical Unit is 1.344725e-9.
- What is the formula to convert Furlong to Astronomical Unit?
- The formula to convert Furlong to Astronomical Unit is: AU = fur × 1.344725e-9. For example, to convert 10 Furlongs to Astronomical Units, you would multiply 10 by 1.344725e-9.
- What is a Furlong?
- The furlong equals 220 yards (201.168 m), one eighth of a mile. It survives almost exclusively in horse racing.
- What is a Astronomical Unit?
- The astronomical unit (AU) is defined as exactly 149,597,870,700 metres, close to the mean Earth–Sun distance. It is the natural yardstick for the Solar System.
- What are the common uses of Furlong?
- The Furlong is commonly used in horse racing, historic land records.
Related Length Conversions
Cite this page
UnitConvertLab. (2026). 18 Furlong to Astronomical Unit. UnitConvertLab. Retrieved from https://unitconvertlab.com/convert/18-furlong-to-astronomical_unit