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PX to REM converter

Convert CSS pixels to rem and back. The usual root size is 16 pixels.

Private by design: this tool runs in your browser. Nothing you add is uploaded.

How to use it

  1. Leave the root size at 16 unless your page sets a different one.
  2. Type pixels to see rem, or rem to see pixels.
  3. Copy the value into your style sheet.
Screenshot of the PX to REM tool on Sureno, in use
PX to REM in use: a real screenshot of this page.

Questions and answers

What is a rem?

A rem is the root font size. At the usual 16 pixel root, 1 rem is 16 pixels and 1.5 rem is 24 pixels.

Why use rem?

Rem sizes grow when a reader makes the text bigger in their browser, which helps people who need large print.

What is 1 rem in pixels?

Usually 16 pixels, the default text size in browsers.

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