18 Foot to Astronomical Unit
Quick answer
18 Foot (ft) equals
3.667432e-11 AU
To convert 18 feet to Astronomical Units, multiply by 2.037462e-12. Therefore, 18 Foot (ft) equals 3.667432e-11 Astronomical Unit (AU).
Formula: AU = ft × 2.037462e-12. Calculation: 18 × 2.037462e-12 = 3.667432e-11 AU.
Convert Foot (ft) to Astronomical Unit (AU) online with our free unit converter. In length, 1 ft = 2.037462e-12 AU. Explore step-by-step conversion steps, mathematical formulas, and quick conversion reference tables below.
Worked example: converting Foot to Astronomical Unit
- Step 1 — start with the formula. AU = ft × 2.037462e-12
- Step 2 — substitute your figure. 18 ft × 2.037462e-12
- Step 3 — read the result. 18 ft = 3.667432e-11 AU
- Step 4 — check it in reverse. ft = AU × 4.908067e+11 returns 18 ft, which matches the figure you started with.
Length Converter
31 units available
18 ft = 3.667432e-11 AU
Formula:
AU = ft × 2.037462e-12With your value: 18 ft = 3.667432e-11 AU
How big is that?
Everyday references on a logarithmic scale, all expressed in foot so you can sanity-check the result.
Other Foot to Astronomical Unit conversions
Foot to Astronomical Unit Conversion Table
| Foot (ft) | Astronomical Unit (AU) |
|---|---|
| 0.5 | 1.018731e-12 |
| 1 | 2.037462e-12 |
| 2 | 4.074924e-12 |
| 5 | 1.018731e-11 |
| 10 | 2.037462e-11 |
| 15 | 3.056193e-11 |
| 20 | 4.074924e-11 |
| 25 | 5.093655e-11 |
| 50 | 1.018731e-10 |
| 100 | 2.037462e-10 |
| 250 | 5.093655e-10 |
| 500 | 1.018731e-9 |
| 1000 | 2.037462e-9 |
Astronomical Unit to Foot Conversion Table
| Astronomical Unit (AU) | Foot (ft) |
|---|---|
| 0.5 | 245,403,331,200.78738 |
| 1 | 490,806,662,401.57477 |
| 2 | 981,613,324,803.1495 |
| 5 | 2.454033e+12 |
| 10 | 4.908067e+12 |
| 15 | 7.362100e+12 |
| 20 | 9.816133e+12 |
| 25 | 1.227017e+13 |
| 50 | 2.454033e+13 |
| 100 | 4.908067e+13 |
| 250 | 1.227017e+14 |
| 500 | 2.454033e+14 |
| 1000 | 4.908067e+14 |
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.
Foot (ft)
Length
1 foot = 0.3048 m exactly (international foot, 1959).
The US survey foot (1200/3937 m) was deprecated for new work on 31 December 2022 and differs by about 2 ppm.
Source: International Yard and Pound Agreement of 1959; NIST Federal Register Notice 59-5442
US, UK, Canada, Australia, New Zealand, South Africa · 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 Foot to Astronomical Unit
To convert from Foot (ft) to Astronomical Unit (AU), multiply the value by 2.037462e-12.
Formula: AU = ft × 2.037462e-12
Reverse: ft = AU × 4.908067e+11
Step-by-Step Example
- Start with your value in Foot. For example: 5 ft
- Multiply by the conversion factor: 5 x 2.037462e-12
- The result is: 1.018731e-11 AU
Foot and Astronomical Unit Relationship
This conversion bridges the US Customary / Imperial and Astronomical measurement systems, commonly required when translating scientific data, international engineering specifications, or trade standards. Since 1 Foot represents a fraction of a Astronomical Unit (1 Astronomical Unit ≈ 4.908e+11 feet), the Astronomical Unit is the larger measurement interval. Understanding the relationship between Foot and Astronomical Unit is essential for accurate calculations in physics, engineering, commerce, and daily applications.
About Foot
The foot is an imperial unit equal to 12 inches or 0.3048 meters. It remains widely used in the US, UK, and Canada for everyday measurements.
Fun Fact: The foot was originally based on the length of a human foot, which varied from region to region.
Common uses of Foot: height measurement, real estate, construction.
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 Foot in Astronomical Unit?
- 18 Foot equals 3.667432e-11 Astronomical Unit.
- How many Astronomical Units are in 1 Foot?
- There are exactly 2.037462e-12 Astronomical Units in 1 Foot. This means the conversion factor from Foot to Astronomical Unit is 2.037462e-12.
- What is the formula to convert Foot to Astronomical Unit?
- The formula to convert Foot to Astronomical Unit is: AU = ft × 2.037462e-12. For example, to convert 10 feet to Astronomical Units, you would multiply 10 by 2.037462e-12.
- What is a Foot?
- The foot is an imperial unit equal to 12 inches or 0.3048 meters. It remains widely used in the US, UK, and Canada for everyday measurements.
- 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 Foot?
- The Foot is commonly used in height measurement, real estate, construction.
Related Length Conversions
Cite this page
UnitConvertLab. (2026). 18 Foot to Astronomical Unit. UnitConvertLab. Retrieved from https://unitconvertlab.com/convert/18-foot-to-astronomical_unit