Convert Femtometers to Angstroms
Convert Femtometers (fm) to Angstroms (Å) instantly and accurately.
Conversion Formula
Å = fm × 1.000000000e-5
About Femtometers
A femtometer (fm) is an incredibly tiny unit equal to one quadrillionth of a meter (10⁻¹⁵ m). To put this in perspective, if an atom were the size of a football field, a femtometer would be the size of a marble. This unit is primarily used in nuclear physics to measure the size of atomic nuclei, protons, and neutrons. The proton, for example, has a diameter of about 1.7 femtometers.
About Angstroms
An angstrom (Å) is equal to 0.1 nanometers or 10⁻¹⁰ meters, named after Swedish physicist Anders Jonas Ångström. While not an official SI unit, it remains widely used in chemistry, solid-state physics, and crystallography to express atomic distances and wavelengths. A typical atom has a diameter of 1-3 angstroms, and the spacing between atoms in crystals is commonly measured in angstroms. X-ray crystallographers use angstroms to describe molecular structures with atomic precision.
Quick Reference Table
| Femtometers (fm) | Angstroms (Å) |
|---|---|
| 1 fm | 1 × 10-5 Å |
| 2 fm | 2 × 10-5 Å |
| 5 fm | 5 × 10-5 Å |
| 10 fm | 0.0001 Å |
| 25 fm | 0.00025 Å |
| 50 fm | 0.0005 Å |
| 100 fm | 0.001 Å |