Calculator
What the Angstrom Converter does
Angstrom Converter: 1 Å = 0.1 nm, so multiply a angstrom value by 0.1 to get nanometre, or divide to go back. Example: 1 Å = 0.1 nm.
The Angstrom Converter takes Value, From and To and returns Result, How it was calculated and Reverse conversion. You can nudge a single number and watch the effect straight away.
Most people who open the Angstrom Converter are people following a recipe or spec written elsewhere. Two industries often use the same word for slightly different quantities.
There is no account, no upload and no server round trip, because the page does the work itself.
Further down the page: what each field expects, how the result is derived, and one example worked from the defaults.
What do the Angstrom Converter fields mean?
The Angstrom Converter uses 3 inputs. Pre-filled inputs double as documentation: each one shows what a reasonable value looks like.
| Field | What to enter | Default |
|---|---|---|
| Value | required | 1 |
| From | choose from Nanometre (nm), Micrometre (µm), Angstrom (Å), Millimetre (mm), Centimetre (cm) or Metre (m) | Angstrom (Å) |
| To | choose from Nanometre (nm), Micrometre (µm), Angstrom (Å), Millimetre (mm), Centimetre (cm) or Metre (m) | Nanometre (nm) |
How does the Angstrom Converter work?
Both units are converted through length's base unit (m), so any of the 19 units in the dropdowns can be paired in either direction without loss of accuracy.
The constants come from the SI brochure and the 1959 international yard-and-pound agreement. For quantities defined empirically rather than by treaty, the current CODATA or IAU value is used instead.
Worked example
These are the values the Angstrom Converter loads by default, and the result it produces from them. This is the worked example the page starts from, reproduced here so you can check the arithmetic.
| Value | 1 |
|---|---|
| From | Angstrom (Å) |
| To | Nanometre (nm) |
| Result | 0.1 nm |
|---|---|
| How it was calculated | 1 Å = 0.1 nm, so 1 × 0.1 = 0.1 nm |
| Reverse conversion | 10 Å (if you meant 1 nm) |
The angstrom
The angstrom (Å) equals exactly 10⁻¹⁰ metres (0.1 nanometres), named after 19th-century Swedish physicist Anders Jonas Ångström, who used it to catalogue the wavelengths of light in the solar spectrum.
Worth knowing
- It remains the standard unit for atomic radii and interatomic bond lengths in chemistry and crystallography. A typical covalent bond is roughly 1 to 2 Å long, and the hydrogen atom’s Bohr radius is about 0.53 Å.
- Visible light spans roughly 4,000 to 7,000 Å (400 to 700 nm), which is the context Ångström originally devised the unit for before it broadened into general atomic-scale use.
- The angstrom is not an SI unit and modern scientific style guides recommend the nanometre or picometre instead, but it remains deeply embedded in older crystallography and spectroscopy literature, so conversions between the two are still routinely needed.
Definitions: BIPM SI Brochure · NIST reference on units
How to use it
- Put Value.
- Pick a value for From: the options are Nanometre (nm), Micrometre (µm), Angstrom (Å), Millimetre (mm), Centimetre (cm) or Metre (m).
- Pick a value for To: the options are Nanometre (nm), Micrometre (µm), Angstrom (Å), Millimetre (mm), Centimetre (cm) or Metre (m).
- The tool reacts immediately rather than waiting for you to finish the form.
- The results panel then shows Result, How it was calculated and Reverse conversion.
- Copy Link puts the current inputs in the URL, so bookmarking it brings the same numbers back.
What this tool does not do
- Repeated conversions compound rounding, so convert once from the original value where you can.
- Conversion factors use SI definitions; some industries use their own rounded factors.
- The method is fixed. There is no option to substitute your own formula.
- Check that each figure is in the unit the label asks for; that is the most common source of a wrong result.
Frequently asked questions
Only Value, From and To. Every box already holds a working value, which means a single edit is enough to get a meaningful answer.
With the values loaded when the page opens, result comes out as 0.1 nm. The figure is derived from the inputs above, so it updates whenever they do.
Nothing is stored. The page has no back end to send data to, and holds your input only in memory.
No. There is no account, no usage cap and no trial period. The site is funded by advertising rather than by charging for the tools.
It matches what you would get working it out by hand, with fewer opportunities to slip.