Convert between Pixels, Em, Rem, Points & Percentages
This free font size converter helps web developers and designers quickly convert between different CSS font size units. Whether you're working with pixels (px), em units, rem units, points (pt), or percentages, this tool provides instant conversions with a live preview.
How to use: Simply enter a value in any unit, and see instant conversions to all other units. Adjust the base font size for accurate em/rem calculations, and click any result to copy it to your clipboard.
Base font size affects em/rem calculations. Standard browser default is 16px.
The quick brown fox jumps over the lazy dog
Font size: 16px
| Pixels | Em | Rem | Points | Percent |
|---|
Precise calculations based on standard web typography ratios
See how your font size looks in real-time as you convert
Click any converted value to instantly copy it to your clipboard
Quick reference table for common font size conversions
Adjust base font size for accurate em/rem calculations
Works perfectly on all devices - phones, tablets, and desktops