Convert between px, rem, and pt based on a root font size.
Assumes 96 pixels per inch (common web standard for pt conversion).
Enter value and source unit. Pick target unit, set base size if needed. Conversion instant.
Modern CSS has many units; converting between px and rem constantly. Tool handles math.
Rem: root size (predictable); em: parent size.
Rem respects browser font settings, improving accessibility.
Default 16px, customizable.
1vw=1% viewport width; used for responsive.