# Electric Constant Constant

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

## electricConstant

Electric constant (vacuum permeability)

Try it yourself:

```calculio
electricConstant
```

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## Electric Constant

The **electricConstant**, also called vacuum permittivity, relates electric fields, charge, and capacitance in SI electromagnetic equations.

## Vacuum formulas

Use it with [coulomb](https://calcul.io/constants/coulomb/index.md) and [magneticConstant](https://calcul.io/constants/magneticConstant/index.md). Material permittivity differs from the vacuum constant, so apply relative permittivity when appropriate.

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