Physics & Engineering
PX to REM Converter
rem = px / root px
Educational estimates only. Not medical, legal, tax, or financial advice.
Guide: PX to REM Converter
What it does
Divides target px by root px.
How to use it
Enter root font size and target pixels.
Formula
rem = target_px ÷ root_px.
Example
24 px with 16 px root → 1.5 rem.
FAQs
What about em?
em is relative to parent font; rem is relative to root—this tool outputs rem.
User zoom?
rem scales with root font size, helping accessibility when users zoom.
Root not 16px?
Always match the root font size your stylesheet sets on html.