CSS Unit Converter
Convert between px, vw, vh, rem, em, and percentage. Responsive CSS units made easy.
Enter a value to convert
Unit Guide
vw
1% of viewport width
vh
1% of viewport height
vmin
1% of smaller dimension
vmax
1% of larger dimension
rem
Relative to root font size
em
Relative to parent font size
How to Use CSS Unit Converter
- Enter a value in any CSS unit
- Set viewport dimensions (default 1920x1080)
- See conversions to all other units
- Copy values for your CSS
About CSS Unit Converter
Convert between CSS units for responsive design. Enter px, vw, vh, rem, em, or percentage and see conversions based on your viewport dimensions. Essential for responsive web development.
Frequently Asked Questions
What are viewport units?
vw is 1% of viewport width, vh is 1% of viewport height. 100vw = full screen width.
Should I use vw for font sizes?
Be careful with vw for fonts - they can become too small on mobile or too large on desktop. Consider clamp() or media queries.
How do I set viewport dimensions?
Enter your target device dimensions. Common sizes are 1920x1080 (desktop), 768x1024 (tablet), 375x667 (mobile).