Convert ångströms to nanometers and 6 other sub-micro units. Includes molecular bond presets, spectrum visualizer, and atomic-scale reference table.
The ångström (Å) is a unit of length equal to 10⁻¹⁰ meters, or exactly 0.1 nanometers. It occupies a sweet spot for expressing atomic and molecular dimensions: bond lengths, crystal lattice spacings, and visible-light wavelengths all fall in the convenient range of 1–10,000 Å. While the nanometer has increasingly replaced the ångström in some fields, the Å remains essential in X-ray crystallography, spectroscopy, and materials science.
This converter handles bidirectional ångström ↔ nanometer conversion and simultaneously outputs results in picometers, micrometers, millimeters, meters, inches, and Bohr radii. Preset buttons cover key molecular benchmarks like the O-H bond length (0.96 Å), DNA base-pair spacing (3.4 Å), and visible-light wavelengths.
A built-in electromagnetic spectrum visualizer places your wavelength on a color gradient so you can instantly see where the value falls between violet (380 nm) and red (780 nm). A reference table lists common atomic radii, bond lengths, and spectral thresholds for quick comparison.
Scientists frequently need to switch between ångströms, nanometers, and picometers when reading papers from different journals. This tool converts instantly between all three plus four additional units, and the spectrum visualizer adds context for optical wavelengths in teaching, research, and instrument interpretation workflows across interdisciplinary teams. It reduces mistakes when reconciling mixed-unit data.
Nanometers = Ångströms ÷ 10 Ångströms = Nanometers × 10 1 Å = 100 pm = 10⁻¹⁰ m = 10⁻⁴ µm
Result: 550 nm
5,500 Å ÷ 10 = 550 nm. This wavelength corresponds to green light near the peak sensitivity of the human eye.
X-ray crystallographers express unit cell dimensions and interatomic distances in ångströms because these values typically fall between 1 and 20 Å — convenient numbers to read and compare. The Protein Data Bank (PDB) stores all atomic coordinates in ångströms, and virtually every structural biology paper uses Å for bond lengths and resolution.
Nanotechnology literature favors the nanometer because nanostructures (10–100 nm) are awkward to express in ångströms (100–1,000 Å). Semiconductor fabrication uses nanometers for process nodes (e.g., 3 nm). Meanwhile, spectroscopists studying X-rays and UV light often prefer ångströms because wavelengths fall in 0.1–4,000 Å. Both units coexist and serve their respective fields well.
When reading older papers, watch for the non-standard abbreviation "A.U." or "a.u." which sometimes meant ångström units but can also mean atomic units or astronomical units depending on context. Always check the paper's notation section. In databases, search for both Å and nm to avoid missing relevant results published in either unit.
Exactly 0.1 nm. The ångström is one-tenth of a nanometer, or 100 picometers.
Yes. It is the standard unit in X-ray crystallography, atomic physics, and many spectroscopy journals, even though the nanometer is preferred in nanotechnology.
The symbol is Å (capital A with a ring above). On most keyboards you can type it with Alt codes or Unicode U+00C5.
Atomic radii range from about 0.3 Å (helium) to 2.7 Å (cesium). So 1 Å is roughly the size of a small atom.
The SI uses prefixed meters (nm, pm). The ångström predates SI but is still accepted by the BIPM because of its widespread use in crystallography.
Multiply by 100. For example, 1.54 Å (C-C bond) = 154 pm.