---
title: "Brewster's Angle calculator — AperiOptic"
description: "Polarization angle between two media. Free online optics calculator, with the formula and code snippets."
url: "https://aperioptic.com/calculators/brewsters-angle"
---

# Brewster's Angle calculator

Polarization angle between two media.

Category: [Photonics](https://aperioptic.com/calculators)

Formula: `θB = atan(n₂/n₁)`

## Inputs

| Input | Parameter | Unit | Default |
| --- | --- | --- | --- |
| n₁ | `n1` |  | 1 |
| n₂ | `n2` |  | 1.5 |

## Result with the default inputs

- Brewster angle: 56.3099 °

Open it with your own values: put each input in the address as a parameter, for example [`/calculators/brewsters-angle?n1=1`](https://aperioptic.com/calculators/brewsters-angle?n1=1). A unit other than the listed one goes in `<parameter>_unit`.

Read more: [Wikipedia: Brewster's angle](https://en.wikipedia.org/wiki/Brewster%27s_angle)

[All optics calculators](https://aperioptic.com/calculators)

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The interactive page: https://aperioptic.com/calculators/brewsters-angle (AperiOptic runs in the browser; free, no account). Every page of the site as Markdown: https://aperioptic.com/llms.txt