CSS Unit Converter
Quickly convert between CSS units like PX, REM, and EM.
CSS Unit Converter
Change any value to see instant conversion in other units.
How to Use the Tool
- Set the Base Font: Optionally, adjust the "Base Font Size". The default of 16px is common in most browsers.
- Enter a Value: Type a value into any of the fields (PX, REM, or EM).
- See the Conversion: Other fields will update automatically to show the equivalent value.
Frequently Asked Questions (FAQ)
What are relative units in CSS?
Relative units, like rem and em, are measurements whose final value depends on another property's size. They are essential for responsive layouts.
What is the difference between REM and EM?
REM (Root EM) is relative to the font size of the root HTML element. EM is relative to the font size of its nearest parent element.
Why is the default base font size 16px?
16px is the default font size in the vast majority of web browsers, reflecting the most common scenario.
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