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PX to EM Converter

Developer Tools

Convert pixel values to EM units for responsive web design.

⚡ Instant🔒 Private, in your browser🆓 Free, no sign-up👥 For developers
Your data never leaves your browser. We do not store inputs.

What PX to EM Converter does

The PX to EM Converter converts pixel values into em units based on a parent font size you specify (16px by default, the common browser base), and converts back from em to px just as easily. It's built for responsive CSS work, where em units scale relative to font size rather than staying fixed like pixels.

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Reviewed by the FreeToolsVerse team · Last updated · How we check our tools

How to use PX to EM Converter

  1. Enter a pixel value and the parent/base font size (default 16px)
  2. View the equivalent em value calculated instantly
  3. Switch direction to convert an em value back to pixels
  4. Copy the converted value for your stylesheet

Who should use it

Made for developers. Typical uses:

  • Converting a design spec's pixel measurements into em units for a responsive CSS stylesheet
  • Checking what em value corresponds to a specific pixel size given a non-default base font size
  • Adjusting font-size or spacing values so they scale properly with a user's font-size preferences

Frequently asked questions

Is the PX to EM Converter free to use?
Yes, completely free.
Is my data uploaded anywhere?
No, it's simple math done in your browser.
What base font size does it assume?
16px by default, matching most browsers' default, but you can change it to match your project's actual base font size.
Why use em instead of px in CSS?
Em units scale relative to font size, making layouts more accessible and responsive to a user's font-size preferences or zoom level.
Is em the same as rem?
No, em is relative to the nearest parent's font size, while rem is always relative to the root (html) element's font size.

Learning resources

Explore more in Developer Tools, read the guides and articles, or see how we test our tools.

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