About Font Size Converter
Convert font sizes between pixels (px), points (pt), em, rem, and percentages. Set a base font size to calculate accurate em/rem/percentage conversions. Essential for web designers and developers working with responsive typography across different CSS units.
How to Use Font Size Converter
- 1
Set base font size
Enter your root/base font size (default 16px) for accurate em/rem calculations.
- 2
Enter a value
Type a font size in any unit — px, pt, em, rem, or %.
- 3
See all conversions
All equivalent values in other units are displayed instantly.
Common Use Cases
- Converting print point sizes to web pixel sizes
- Calculating rem values for responsive CSS
- Matching design mockup font sizes to CSS units
- Ensuring consistent typography across platforms
Frequently Asked Questions
What is the difference between em and rem?
How many points is one pixel?
What base size should I use?
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