Free. No Sign-Up Required. No Limits. Read More
PX to EM Converter
Quickly convert CSS px units to em units.
Conversion Result
What is a PX to EM Converter?
A PX to EM Converter is a free online tool that converts pixel values into EM units for CSS styling. EM is a relative CSS unit based on the parent element's font size. Unlike REM which references the root element, EM values cascade through nested elements, making them ideal for component-level responsive typography and modular design systems.
How PX to EM Conversion Works
The formula is simple: divide the pixel value by the parent element's font size. For example, if the parent font size is 16px and you want to convert 24px, the result is 24 ÷ 16 = 1.5em. This tool handles the calculation instantly so you can focus on building your layouts.
- Enter the pixel value you want to convert.
- Set the parent element's font size (default is 16px).
- Click Convert to get the EM equivalent.
- Use the result directly in your CSS stylesheets.
When to Use EM Units in CSS
EM units are particularly useful for building scalable components. When you set a component's base font size, all child elements using EM will scale proportionally. This is valuable for buttons, cards, navigation menus, and other reusable UI components where proportional scaling matters.
EM vs REM: Key Differences
- EM is relative to the parent element's font size; REM is relative to the root element.
- EM values compound when nested; REM values remain consistent.
- Use EM for component-level scaling; use REM for global consistency.
- Both improve accessibility over fixed pixel values.
PX to EM Conversion Table
| Pixels (px) | EM (parent 16px) |
|---|---|
| 10px | 0.625em |
| 12px | 0.75em |
| 14px | 0.875em |
| 16px | 1em |
| 18px | 1.125em |
| 20px | 1.25em |
| 24px | 1.5em |
| 32px | 2em |
FAQs
1. What is the formula for PX to EM?
Divide the pixel value by the parent element's font size. For example, 24px ÷ 16px = 1.5em.
2. What happens when EM units are nested?
EM values compound in nested elements. If a parent is 1.5em and a child is 1.5em, the child's actual size is 1.5 × 1.5 = 2.25 times the root font size.
3. Should I use EM or REM for font sizes?
Use REM for global font sizes and EM for component-level scaling where proportional sizing within a component is needed.
4. Is 1em always equal to 16px?
No. 1em equals the parent element's font size. It is 16px only if the parent's font size is 16px.
5. Is this PX to EM Converter free?
Yes, this tool is completely free with no signup or installation required.