Set superscript and subscript in formatted text in wpf

You use Typography.Variants:

<TextBlock>
    <Run>Normal Text</Run>
    <Run Typography.Variants="Superscript">Superscript Text</Run>
    <Run Typography.Variants="Subscript">Subscript Text</Run>
</TextBlock>

You can use something like <TextBlock>5x<Run BaselineAlignment="Superscript">4</Run> + 4</TextBlock>.

However, as far as I know, you will have to reduce the font-size yourself.

It's interesting to note that for some characters (m², m³, etc) a superscript is not needed, but the unicode character can be used. For example:

<Run Text=" m&#x00B3;" />

This would show m³.