REM to PX converter

Convert REM to pixels (PX) online for free. Fast, bidirectional REM to PX calculator with custom base size.

In your browser

Base font size

Root <html> font size (browser default is 16px)

Pixels (PX)

Absolute unit

Root EM (REM)

rem

Relative to root

Relative EM (EM)

Relative to parent

CSS Snippet

Editable preview at the exact font size.

Click inside the box to edit text

Calculated using base font size of . Click any row to use it.

1rem =

Pixels	REM	EM	Tailwind Class	Action

Also with the px to rem converter

PX to REM converter: all options PX to REM converter EM to PX converter

Convert CSS REM units back into pixels (PX). Enter any REM value to see the exact pixel measurement calculated from your base root font size.

How do I convert REM to PX?

Multiply the REM value by your base font size (usually 16px): rem × 16 = px (for example, 1.5rem × 16 = 24px).

Why should I use REM instead of PX in CSS?

REM units scale relative to the user’s browser root font size, making your website accessible to users who adjust default font sizing or zoom levels.

What is the standard base font size?

The default root font size in all modern web browsers is 16px (1rem = 16px).

What is the difference between REM and EM?

REM is relative to the root <html> element, while EM is relative to the font-size of its immediate parent container.

How do I calculate REM from PX?

Divide the pixel value by your base font size: px / base = rem (for example, 24px / 16px = 1.5rem).

Is my data uploaded?

No. This tool runs in your browser, so your text and files never reach our server.

Is this tool free?

Yes. It’s free to use with no sign-up and no limits for normal use.