A surveyor's chain is 66 feet.
Chains to Angstroms Converter — ch to A
Convert Chain (ch) to Angstrom (A) using the exact conversion factor (1 chain = 201,168,000,000 angstrom). See the formula, worked examples, conversion table, history, and common uses.
Chains to Angstroms converter
Converter
Length Converter
Convert SI, imperial, US customary, astronomical, scientific, and historical length units.
Context values
Some unit families need one extra value for a physically accurate result.
An angstrom is 1e-10 meters.
Result = input x 20.1168 / 1e-10.
Length uses the meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Chains to Angstroms
Chain and Angstrom both measure length. Specifically: A surveyor's chain is 66 feet, and an angstrom is 1e-10 meters.
Formula
angstroms = chains × 201168000000
This factor comes from each unit's defined relationship to the category's base unit: 1 chain equals 20.1168 base units, and 1 angstrom equals 1e-10 base units, so dividing one by the other gives the direct chain-to-angstrom factor of 201168000000.
Simple example
1 ch × 201168000000 = 201,168,000,000 A
1 chain = 201,168,000,000 angstroms.
Real-world example
10 ch × 201168000000 = 2.01168e+12 A
10 chains = 2.01168e+12 angstroms.
Conversion table
| Chain (ch) | Angstrom (A) |
|---|---|
| 1 ch | 201,168,000,000 A |
| 5 ch | 1.00584e+12 A |
| 10 ch | 2.01168e+12 A |
| 21.0975 ch | 4.244142e+12 A |
| 42.195 ch | 8.488284e+12 A |
| 100 ch | 2.01168e+13 A |
Reverse conversion: Angstrom to Chain
1 A × 4.97097e-12 = 4.97097e-12 ch
1 angstrom = 4.97097e-12 chains.
chains = angstroms × 4.97097e-12
For a page dedicated to this direction, see Angstrom to Chain.
Understanding the Chain (ch)
A surveyor's chain is 66 feet.
Understanding the Angstrom
Angstrom (A) measures length. Equal to exactly 10⁻¹⁰ meters (0.1 nanometers) — a scale convenient for describing atomic radii, bond lengths, and crystal structures. It is classified as a non-SI unit, still common in chemistry and crystallography.
Where it's used: Widely used internationally in chemistry, crystallography, and atomic/molecular physics
Uses of the Angstrom today
- Atomic and ionic radii in chemistry
- Chemical bond-length measurements
- X-ray crystallography and wavelength measurements
History of the Angstrom
The angstrom is named after Anders Jonas Ångström (1814–1874), a Swedish physicist and one of the founders of spectroscopy, who used the unit in his 1868 atlas of the solar spectrum.
Historical origin. Angstrom was not the invention of a single named person; it developed through the process described above.
Angstrom — sources
- NIST Guide to the SI, Appendix B — Lists the angstrom among non-SI units still in use with an exact SI equivalence.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many angstroms are in 1 chain?
1 chain equals 201,168,000,000 angstroms, using the exact defined conversion factor rather than an estimate.
How do I convert chain to angstrom?
Multiply the chain value by 201168000000. The converter above does this instantly to whatever precision you set.
How do I convert angstrom back to chain?
Use the reverse factor: 1 angstrom equals 4.97097e-12 chains. You can also use the swap control in the converter above to flip the direction instantly.
What is a chain?
Chain (ch) is a unit of length.
What is a angstrom?
Angstrom (A) measures length. Equal to exactly 10⁻¹⁰ meters (0.1 nanometers) — a scale convenient for describing atomic radii, bond lengths, and crystal structures. It is classified as a non-SI unit, still common in chemistry and crystallography.
Is the chain to angstrom conversion exact?
Yes. Equal to exactly 10⁻¹⁰ meters (0.1 nanometers) — a scale convenient for describing atomic radii, bond lengths, and crystal structures. That fixed definition is what the converter above uses, so any rounding you see is a display choice, not a limitation of the math.