What is the difference between em and rem units?

Em units are relative to the parent element's font size, while rem units are relative to the root element's font size. Rem units provide more consistent sizing across your design.

What is the standard base font size for web browsers?

The standard base font size for most web browsers is 16 pixels. This means 1em or 1rem equals 16px by default, unless changed in browser settings or CSS.

How many pixels are in a point?

One point (pt) equals approximately 1.333 pixels on screen displays. This is based on the standard 96 DPI screen resolution where 1pt = 1/72 inch.

Which unit should I use for responsive web design?

For responsive web design, rem units are recommended for font sizes as they scale well and maintain consistency. Em units work well for spacing that should scale with text size.

Can I convert between percentage and other font units?

Yes! Our tool also supports percentage conversions. 100% equals the base font size (usually 16px), so 150% would be 24px with a 16px base.

Free Online Font Size Converter (No Signup)

About This Tool

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.

How to Use This Tool

Enter a font size value — Type the numeric size you want to convert in the input field.
Select the unit type — Choose the unit you are converting from: Pixels (px), Em, Rem, Points (pt), or Percent.
Adjust the base font size — Use the slider to change the base size (default 16px) for accurate em/rem/percent calculations.
View instant results — See the converted values in all other units displayed in the results cards below.
Click to copy — Click any result card to copy that value to your clipboard for use in your CSS.

Common Use Cases

How do I convert pixels to em? Enter your pixel value, ensure the base font size matches your project (usually 16px), and read the em value from the results.
What is 14px in rem? Type 14 with Pixels selected, and the Rem card will show 0.875rem (at the default 16px base).
How do I convert points to pixels for screen display? Select Points as your input unit, enter the value, and read the Pixels result -- useful when translating print designs to web.
What percentage equals 24px? Enter 24px and check the Percent card to see the relative percentage based on your chosen base font size.
How do I preview what a font size looks like? Enter any value and the live preview section shows sample text rendered at that size in real time.

Font Size Converter

About This Tool

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Recent Conversions

Common Font Size Conversions

Accurate Conversions

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Reference Table

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How to Use This Tool

Common Use Cases