# FAQ: Sizing Elements - Relative Measurements

This community-built FAQ covers the “Relative Measurements” exercise from the lesson “Sizing Elements”.

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This exercise can be found in the following Codecademy content:

## FAQs on the exercise Relative Measurements

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I am having a difficult time understanding how using relative measurements (especially the EM and REM measurements for text) does anything for responsive design. Here’s my problem: I understand that EM is calculated relative to parent size and REM is calculated relative to the root size.

BUT

… since both the parent size and root size are set in pixels, how does converting other measurements into EM and REM change anything?

Are we missing a next step here? For example … will there be a step where we learn to define either the parent or root default differently for different types of screens?

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