# Bohr radius conversions

length conversions » Bohr radius conversionsThe online converter calculator on this page allows you to select the length/distance measurement unit you want to convert to starting from Bohr radius (a0). To make a conversion starting from a unit of length other than Bohr radius, simply click on the "Reset" button.

## What is Bohr radius?

### Definition:

The Bohr radius is a unit of length in atomic units. It expresses the most likely position of the electron in a hydrogen atom, the simplest atom, in its ground state (the Bohr model of an atom). The Bohr radius unit is named after the Danish physicist Niels Henrik David Bohr (1885 - 1962), who made fundamental contributions to understanding the atomic structure and quantum mechanics.

The Bohr radius of hydrogen has a value of approximately 5.3x10-11 meters (a0 ≈ 5.3x10-11 m), the base unit of length in the International System of Units (SI). It is also equal to approximately 0.53 angstroms (Å) (a non-SI unit of length), or 5.3x10-5 micrometers (μm), or 5.3x10-8 millimeters (mm) or 5.3x10-9 centimeters (cm), which are SI units of length.

The Bohr radius is used in atomic physics calculations.

### Symbol:

a0

### Plural:

Bohr radius

Below you can find a comprehensive list with conversions from Bohr radius to other (metric, imperial, or customary) length and distance measurement units.