# Coulomb Constant

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

## coulomb

Coulomb's constant

Try it yourself:

```calculio
coulomb
```

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## Coulomb Constant

**coulomb** is Coulomb’s constant, used in electrostatic force and potential formulas.

## Electrostatic scale

Use it with [elementaryCharge](https://calcul.io/constants/elementaryCharge/index.md) and [electricConstant](https://calcul.io/constants/electricConstant/index.md). Distances must be in metres and charges in coulombs for SI results.

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