# Bohr Radius Constant

Use Bohr Radius in Calcul.io. See what this built-in constant represents, enter it in an editable calculation, and review related values and units.

## bohrRadius

Borh radius

Try it yourself:

```calculio
bohrRadius
```

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## Bohr Radius

The **bohrRadius** is a characteristic atomic length scale, approximately the radius of the hydrogen ground-state orbit in the Bohr model.

## Atomic-scale length

Use it with [fineStructure](https://calcul.io/constants/fineStructure/index.md) and [electronMass](https://calcul.io/constants/electronMass/index.md) in atomic formulas. It is a length in metres; do not mix it with angstrom values without converting units.

[All constants](https://calcul.io/constants/index.md)