Convert Kilometer to Angstrom
Convert kilometers to angstroms instantly. 1 kilometer = 1e+13 angstrom — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Angstrom to Kilometer converter for the reverse conversion.
Units explained
Kilometer
A kilometer is a metric unit of length equal to one thousand meters. It is the standard unit for measuring road distances, geographic distances, and other large-scale measurements in metric countries.
The kilometer was defined alongside the meter in 1795 using the standard SI prefix kilo- (from Greek chilioi, "thousand"), denoting one thousand units.
Kilometers are used worldwide (except the United States and a few others) for road signage, geographic distance, athletic events, and scientific distances at planetary scale. Speed limits in most countries are given in km/h.
Adopted 1795 in France as part of the original metric system; the kilometer became the global standard for road and geographic distance through the 19th and 20th century metric adoption.
Angstrom
An angstrom is a unit of length equal to exactly 10⁻¹⁰ meters (0.1 nm). Named after Swedish physicist Anders Jonas Ångström, it is the traditional unit for atomic and molecular dimensions in chemistry and crystallography.
Defined in 1907 as exactly 10⁻¹⁰ m. Although officially deprecated by the BIPM in favor of the nanometer in 1978, the angstrom remains in widespread use in chemistry and crystallography.
Angstroms express bond lengths (typical covalent bond is 1–2 Å), atomic radii, crystal lattice parameters, and X-ray wavelengths. Standard in chemistry textbooks and crystallographic data tables.
Named after Anders Jonas Ångström; defined at 10⁻¹⁰ m in 1907; deprecated as SI by BIPM in 1978 but retained universally in chemistry practice.
Kilometer to Angstrom conversion formula
The relationship between kilometers and angstroms:
To convert kilometers to angstroms, multiply the value in kilometers by 1e+13. To reverse, multiply angstroms by 1e-13.
How to use this converter
Type a value into the calculator. The result in angstroms updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Angstrom to Kilometer converter for the reverse direction.
Step-by-step: convert kilometers to angstroms
- Write down the value in kilometers (km).
- Multiply that value by the factor 1e+13.
- The product is the equivalent value in angstroms (Å).
- To reverse, multiply the angstrom value by 1e-13.
Worked examples
Example 1 — Convert 1 km to Å:
1 × 1e+13 = 1e+13 Å
Example 2 — Convert 100 km to Å:
100 × 1e+13 = 1e+15 Å
Real-world example — Kilometres to wavelengths
One kilometer equals one trillion angstroms — a conversion physics teachers use to convey the gulf between everyday geographic and atomic scales.
1 km × 1e+13 = 1e+13 Å
Real-world example — Geographic to wavelength scale
One kilometer equals one trillion angstroms — illustrating the 12-order-of-magnitude span between geographic distance and atomic-feature scales.
1 km × 1e+13 = 1e+13 Å
Kilometer to Angstrom conversion table
Standard reference values for converting kilometers to angstroms:
| Kilometer [km] | Angstrom [Å] |
|---|---|
| 0.01 | 1e+11 |
| 0.1 | 1e+12 |
| 1 | 1e+13 |
| 2 | 2e+13 |
| 3 | 3e+13 |
| 4 | 4e+13 |
| 5 | 5e+13 |
| 10 | 1e+14 |
| 20 | 2e+14 |
| 30 | 3e+14 |
| 40 | 4e+14 |
| 50 | 5e+14 |
| 100 | 1e+15 |
| 500 | 5e+15 |
| 1000 | 1e+16 |
Frequently asked questions
How many angstroms is 1 kilometer?
How do I convert kilometers to angstroms?
How do I convert angstroms back to kilometers?
How many angstroms is 100 kilometers?
Popular length unit conversions
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Metric / SI (17 units)
Imperial / US Customary (27 units)
Nautical (1 units)
Astronomical (9 units)
Atomic / Physics (6 units)
Typographic (3 units)
Sources & references
Conversion factor (1 km = 1e+13 Å) verified against the following authoritative sources:
- BIPM — The International System of Units (SI Brochure 9th ed.)
Official BIPM publication defining the seven SI base units (including the meter) and the rules for their use. The global authority on units of measurement.
- NIST — Guide to the SI
US National Institute of Standards and Technology reference covering the SI base and derived units with definitions and usage rules for US technical practice.
- NIST Special Publication 811 — Guide for the Use of the International System of Units
Detailed NIST guide covering exact conversion factors between SI and US customary units along with formatting and rounding conventions.
- NIST — Refinement of values for the yard and pound (Federal Register 1959)
The treaty (signed by US
- International Hydrographic Organization — Resolution on the Nautical Mile
International authority that standardised the nautical mile at exactly 1852 m in 1929 — the value adopted worldwide for sea and air navigation.