# Em or % or px

**URL:** https://forum.kirupa.com/t/em-or-or-px/208536
**Category:** Uncategorized
**Created:** [November 29, 2006, 7:56pm UTC](https://forum.kirupa.com/t/em-or-or-px/208536 "2006-11-29T19:56:44Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![Abus](https://yyz1.discourse-cdn.com/flex011/user_avatar/forum.kirupa.com/abus/32/930_2.png) [@Abus](https://forum.kirupa.com/u/Abus)
#### Post date: [November 29, 2006, 7:56pm UTC](https://forum.kirupa.com/t/em-or-or-px/208536/1 "2006-11-29T19:56:44Z")

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I am really kind of confused right know, some of the people use em for everything, Some use % for font-size. And I am used to use px. But when do we really need to use these?

Or if we start with em we should go with em in all the design or what?