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Whiz Tools

PX to REM to EM Converter – Free CSS Unit Calculator

Convert pixels to REM and EM units instantly. Free CSS unit converter for responsive web design. Supports custom font sizes and real-time calculations for accurate results.

PX, REM, and EM Unit Converter

Convert between pixels (PX), root em (REM), and em (EM) units. Enter a value in any field to see the equivalent values in the other units.

px
px
Enter a value in px units
px
Enter a value in rem units
rem
Enter a value in em units
em
Visualization not available for negative or zero values

Conversion Formulas

  • PX to REM: value in px ÷ root font size
  • PX to EM: value in px ÷ parent font size
  • REM to PX: value in rem × root font size
  • EM to PX: value in em × parent font size
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