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REM PX Converter
Convert px to rem, rem to px, and tune the base font size for CSS systems that do not use the default 16px root.
Convert CSS sizes fast
Design specs often arrive in pixels, while production CSS may use rem for accessibility and consistency.
This converter handles both directions and lets you match the root size used in your project.
Frequently Asked Questions
What is the default rem base?
Most browsers default to 16px, so 1rem usually equals 16px unless the root font size is changed.
Why use rem?
rem values scale with user font settings and make typography systems easier to manage.
Can I change the base?
Yes. Set any base pixel value and the conversions update immediately.
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