25 Chain to Astronomical Unit
Quick answer
25 Chain (ch) equals
3.361813e-9 AU
To convert 25 Chains to Astronomical Units, multiply by 1.344725e-10. Therefore, 25 Chain (ch) equals 3.361813e-9 Astronomical Unit (AU).
Formula: AU = ch × 1.344725e-10. Calculation: 25 × 1.344725e-10 = 3.361813e-9 AU.
Convert Chain (ch) to Astronomical Unit (AU) online with our free unit converter. In length, 1 ch = 1.344725e-10 AU. Explore step-by-step conversion steps, mathematical formulas, and quick conversion reference tables below.
Worked example: converting Chain to Astronomical Unit
- Step 1 — start with the formula. AU = ch × 1.344725e-10
- Step 2 — substitute your figure. 25 ch × 1.344725e-10
- Step 3 — read the result. 25 ch = 3.361813e-9 AU
- Step 4 — check it in reverse. ch = AU × 7.436465e+9 returns 25 ch, which matches the figure you started with.
Length Converter
31 units available
25 ch = 3.361813e-9 AU
Formula:
AU = ch × 1.344725e-10With your value: 25 ch = 3.361813e-9 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
Chain and Astronomical Unit Relationship
This calculation facilitates standardized conversion between recognized units of length. Since 1 Chain represents a fraction of a Astronomical Unit (1 Astronomical Unit ≈ 7.436e+9 Chains), the Astronomical Unit is the larger measurement interval. Understanding the relationship between Chain and Astronomical Unit is essential for accurate calculations in physics, engineering, commerce, and daily applications.
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 of Chain: 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 of Astronomical Unit: planetary science, orbital mechanics, astronomy.
Frequently Asked Questions
- What is 25 Chain in Astronomical Unit?
- 25 Chain equals 3.361813e-9 Astronomical Unit.
- How many Astronomical Units are in 1 Chain?
- There are exactly 1.344725e-10 Astronomical Units 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 Chains to Astronomical Units, 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). 25 Chain to Astronomical Unit. UnitConvertLab. Retrieved from https://unitconvertlab.com/convert/25-chain-to-astronomical_unit