Enter the permittivity of the substance and the permittivity of a vacuum into the calculator to determine the dielectric constant.

## Dielectric Constant Formula

The following formula is used to calculate a dielectric constant.

k = E / E_0

- Where k is the dielectric constant
- E is the permittivity of the substance
- E
_{0}is the permittivity of a vacuum. (8.8541878128(13)×10^{−12}F⋅m^{−1})

To calculate a dielectric constant, divide the permittivity of the substance by the permittivity of a vacuum.

In the case of this formula, permittivity can be swapped out for capacitance of the substance or system, and capacitance in a vacuum.

## Dielectric Constant Definition

A dielectric constant is a measure of the permittivity of a substance compared to the permittivity of a vacuum.

## Dielectric Constant Example

How to calculate a dielectric constant?

**First, determine the permittivity of the substance.**Measure of calculate the permittivity of the substance.

**Next, determine the permittivity of the vacuum.**This is typically (8.8541878128(13)×10

^{−12}F⋅m^{−1}).**Finally, calculate the dielectric constant.**Calculate the dielectric constant using the formula above.

## FAQ

**What is a dielectric constant?**

In simple terms, a dielectric constant is a measure of the relative permittivity of an object when compared to a vacuum.

**What is permittivity?**

Permittivity is a measure of how much polarizability a given dielectric has. In other words, how much energy it can store when exposed to an electric field.

**What is a dielectric?**

A dielectric is a substance or object that acts as an electrical insulator. When exposed to an electric field it becomes polarized, thus store energy.