# Weak Mixing Angle Constant

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

## weakMixingAngle

Weak mixing angle

Try it yourself:

```calculio
weakMixingAngle
```

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## Weak mixing angle in electroweak theory

**weakMixingAngle** is the Weinberg angle, a parameter describing how electromagnetic and weak interactions arise from electroweak gauge fields.

## Meaning

Its sine and cosine enter relations among electroweak couplings and boson masses. Use [sin](https://calcul.io/function/sin/index.md) and [cos](https://calcul.io/function/cos/index.md) when evaluating a formula expressed in radians, and compare fundamental electromagnetic scales with [fineStructure](https://calcul.io/constants/fineStructure/index.md).

## Caveats

The precise effective value can depend on energy scale and renormalization convention. Do not treat it as a universal geometric angle; use the stated convention in a source and [pow](https://calcul.io/function/pow/index.md) carefully when a formula uses sin²θ.

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