Chain to Astronomical Unit Converter
Convert Chain (ch) to Astronomical Unit (AU) instantly. 1 ch = 1.344725e-10 AU.
Length Converter
31 units available
1 ch = 1.344725e-10 AU
Formula:
AU = ch × 1.344725e-10With your value: 1 ch = 1.344725e-10 AU
How big is that?
Everyday references on a logarithmic scale, all expressed in chain so you can sanity-check the result.
Other Chain to Astronomical Unit conversions
Chain to Astronomical Unit Conversion Table
| Chain (ch) | Astronomical Unit (AU) |
|---|---|
| 0.5 | 6.723625e-11 |
| 1 | 1.344725e-10 |
| 2 | 2.689450e-10 |
| 5 | 6.723625e-10 |
| 10 | 1.344725e-9 |
| 15 | 2.017088e-9 |
| 20 | 2.689450e-9 |
| 25 | 3.361813e-9 |
| 50 | 6.723625e-9 |
| 100 | 1.344725e-8 |
| 250 | 3.361813e-8 |
| 500 | 6.723625e-8 |
| 1000 | 1.344725e-7 |
Astronomical Unit to Chain Conversion Table
| Astronomical Unit (AU) | Chain (ch) |
|---|---|
| 0.5 | 3,718,232,290.921021 |
| 1 | 7,436,464,581.842042 |
| 2 | 14,872,929,163.684084 |
| 5 | 37,182,322,909.21021 |
| 10 | 74,364,645,818.42043 |
| 15 | 111,546,968,727.63063 |
| 20 | 148,729,291,636.84085 |
| 25 | 185,911,614,546.05103 |
| 50 | 371,823,229,092.10205 |
| 100 | 743,646,458,184.2041 |
| 250 | 1.859116e+12 |
| 500 | 3.718232e+12 |
| 1000 | 7.436465e+12 |
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.
Chain (ch)
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 Chain to Astronomical Unit
To convert from Chain (ch) to Astronomical Unit (AU), multiply the value by 1.344725e-10.
Formula: AU = ch × 1.344725e-10
Reverse: ch = AU × 7.436465e+9
Step-by-Step Example
- Start with your value in Chain. For example: 5 ch
- Multiply by the conversion factor: 5 x 1.344725e-10
- The result is: 6.723625e-10 AU
About Chain
Gunter's chain equals 66 feet (20.1168 m) and underpins the US Public Land Survey System: 10 square chains make one acre.
Common uses: land surveying, cadastral records, cricket pitch length.
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: planetary science, orbital mechanics, astronomy.
Frequently Asked Questions
How many Astronomical Unit are in 1 Chain?
There are exactly 1.344725e-10 Astronomical Unit in 1 Chain. This means the conversion factor from Chain to Astronomical Unit is 1.344725e-10.
What is the formula to convert Chain to Astronomical Unit?
The formula to convert Chain to Astronomical Unit is: AU = ch × 1.344725e-10. For example, to convert 10 Chain to Astronomical Unit, you would multiply 10 by 1.344725e-10.
What is a Chain?
Gunter's chain equals 66 feet (20.1168 m) and underpins the US Public Land Survey System: 10 square chains make one acre.
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 Chain?
The Chain is commonly used in land surveying, cadastral records, cricket pitch length.
Related Length Conversions
Cite this page
UnitConvertLab. (2026). Chain to Astronomical Unit converter. UnitConvertLab. Retrieved from https://unitconvertlab.com/convert/chain-to-astronomical_unit