Pixel (px) to Em Converter
Use our px to em converter to convert px to em instantly for responsive typography. Includes pixel to em conversion, a pixel to em calculator explanation, and how to convert px to em in CSS (convert px to em css).
What is Px to Em Conversion?
Px (pixels) and em are common CSS length units. Pixels are fixed units, while em is a relative unit based on the current font size of the element (or its parent, depending on the property).
If you want responsive layouts, converting pixels to em can help your design scale with the user’s font settings and avoid hard-coded sizes.
This pixel to em converter (pixel to em calculator) converts px to em using a base font size you choose, which matches how you convert px to em in CSS.
Px to Em Conversion Formula
To convert px to em, divide the pixel value by the base font size (in px).
basePx is usually 16px by default in browsers, but you can set it in CSS.
A common CSS conversion when the base font size is 16px.
If a container uses 20px font size, em values scale from 20px.
How to Use the Px to Em Converter
- 1
Enter the base font size (px).
- 2
Enter the pixel value you want to convert.
- 3
The converter calculates em = px ÷ basePx.
- 4
Use the em value in CSS for scalable typography and spacing.
Frequently Asked Questions
Divide the pixel value by the base font size: em = px ÷ basePx.
It’s the same formula: em = px ÷ basePx. If the base is 16px, then 16px = 1em, 32px = 2em, etc.
A tool that converts pixel values into em units based on a chosen base font size.
Most browsers default to 16px for the root font size, but your CSS can change it.
em is relative to font size, which can improve accessibility and responsiveness. px is fixed.
Yes—this px to em converter calculates the em result instantly based on your base size.