Angstrom to nanometer converter
Convert atomic-scale lengths among angstroms, nanometers, and thousandths of an inch with exact unit identities.
The startup example is ready to export.
Enter a length
Required when edited. Use a nonnegative decimal with a period.
Editing this field converts back to angstroms automatically.
One mil equals 0.001 inch or exactly 25,400 nm.
Live result
Nanometer equivalent
1.4 nm
Angstrom equivalent
14 Å
Thousandth-inch equivalent
0.0000551181 mil
14 Å × 0.1 = 1.4 nm
Conversion detail
| Quantity | Value | Metres |
|---|---|---|
| Angstrom | 14 Å | 1.4 × 10⁻⁹ m |
| Nanometer | 1.4 nm | 1.4 × 10⁻⁹ m |
| Thousandth of an inch | 0.0000551181 mil | 1.4 × 10⁻⁹ m |
All rows represent the same physical length. The metre column is included as a common dimensional checkpoint.
How to use the angstrom to nanometer calculator
What this calculator does
This calculator converts one physical length among angstroms, nanometers, and thousandths of an inch. It is designed for atomic-scale and nanoscale measurements, where ordinary metre values become inconveniently small. The conversion is an exact unit identity: one angstrom is 0.1 nanometer, and one nanometer is 10 angstroms. The calculator does not estimate an object's size, identify a material, or decide how many significant figures your experiment supports; it only expresses the same length in different units.
When to use it
Use it when reading crystallography or spectroscopy data reported in angstroms, comparing a molecular dimension with a nanometer-scale specification, translating a legacy engineering value expressed in mils, or checking a unit conversion before placing a number in a report or spreadsheet. The NIST conversion-factor table confirms that an angstrom converts to nanometers by multiplying by 10 – 1.
How to calculate
The calculator opens with a ready-to-use demonstration: 14 Å, 1.4 nm, and approximately 0.0000551181 mil. Its Excel workbook is already built and validated, so the Download Excel button is available immediately.
- Replace the value in any one of the three fields. The field you edit becomes the source value.
- Read the synchronized equivalents in the other fields and in the Live result panel.
- Use the Conversion detail table to compare each unit with the common metre value.
- Select Download Excel to create a current-state workbook with Summary and Inputs sheets.
- Select Reset to clear the demonstration and all calculated content. Download Excel then remains disabled until you enter one complete valid value again.
Input guide
Length in angstroms accepts a required nonnegative decimal when it is the field you edit, such as 14. Use a period as the decimal separator and do not enter scientific notation, unit letters, commas, or negative values. Increasing this input increases every equivalent proportionally; a common mistake is typing “14 Å” instead of the numeric value 14.
Length in nanometers accepts a required nonnegative decimal when edited, such as 1.4. The calculator multiplies it by 10 to obtain angstroms. A value of zero is valid and represents zero length. Do not confuse a nanometer with a micrometer: one micrometer is 1,000 nanometers.
Length in thousandths of an inch accepts a required nonnegative decimal in mils, such as 0.0000551181. One mil is exactly 0.001 inch, which is 25,400 nanometers. This field is useful for cross-system checks, but very small nanoscale lengths naturally produce many leading zeros. Enter the number only; do not append “mil” or an inch mark.
Output guide
Nanometer equivalent is the primary result and reports the same length in nm. Angstrom equivalent reports the exact Å value, while Thousandth-inch equivalent reports mils. The three summary pills repeat these live values for quick scanning. The formula line shows the active conversion operation, and the table's Metres column provides a dimensional cross-check. All outputs are conversions, not estimates or recommendations. Zero means zero physical length; unusually large values are still mathematically valid but may be better expressed in micrometers or millimeters.
Worked example
With the startup value of 14 Å, multiply by 0.1: 14 × 0.1 = 1.4 nm. Converting the same length to metres gives 14 × 10 – 10 m = 1.4 × 10 – 9 m. Because one mil equals 25,400 nm, dividing 1.4 by 25,400 gives approximately 0.0000551181 mil. These are the exact first-open values shown in the controls, result cards, table, and workbook.
Learn more
The nanometer uses the SI prefix nano, meaning 10 – 9; the BIPM SI-prefix reference lists this factor. For a real atomic-scale comparison, the NIST CODATA value for the Bohr radius is about 5.2918 × 10 – 11 m, or roughly 0.52918 Å.
Understanding the units
An angstrom, symbol Å, equals 10 – 10 metre. A nanometer, symbol nm, equals 10 – 9 metre. Since the nanometer is ten times larger, a fixed length has a nanometer number one tenth of its angstrom number. This is why the direction matters: divide angstroms by 10 to obtain nanometers, but multiply nanometers by 10 to obtain angstroms.
The angstrom is widely encountered in atomic physics, chemistry, crystallography, and spectroscopy because bond lengths and lattice spacings often fall near one or a few angstroms. The nanometer is an SI-prefixed metre unit and is common in optics, semiconductor dimensions, microscopy, and nanotechnology. The NIST Guide to the SI provides broader guidance on SI symbols, prefixes, and unit presentation.
Precision and significant figures
The conversion factor itself is exact, but a measured value may not be. If a laboratory result is reported as 14.0 Å, converting it gives 1.40 nm when preserving three significant figures. Extra digits produced by a calculator do not create extra measurement certainty. Keep enough internal precision for subsequent calculations, then round the final reported value according to the quality of the original measurement and the conventions of your field.