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PX to REM Converter
開発者Translate CSS pixel constraints to accessibility-standard rem ratios.
ttb run px-rem-converter
Base Font Size (px)
px
rem
CSS rem properties are relative to the root font size, which defaults to 16px in most modern browsers. Using rems instead of pixels is a best practice for responsiveness and accessibility.
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PX to REM Converter の使い方
Enter a pixel (px) value or rem value. The tool converts between them using the base font size (default 16px). Adjust the root font size if your project uses a different base. The conversion table shows common sizes for quick reference. Critical for building accessible, responsive CSS layouts.
1
Enter your parameters
Configure the inputs for the Px Rem Converter according to your specific needs.
2
View real-time results
The utility instantly processes your request and displays the calculated outputs directly in your browser.
3
Copy or Download
Click the copy icon next to the final output to instantly grab the result, or export it if applicable.
よくある質問
Why should I use rem instead of px?+
Using rem units respects user browser font-size preferences, which is essential for accessibility. If a user sets their browser to 20px base font, rem-based layouts scale accordingly while px-based layouts remain fixed and potentially unreadable.
What is the default root font size?+
All browsers default to 16px as the root font size. So 1rem = 16px by default. Many developers set html { font-size: 62.5% } to make 1rem = 10px for easier mental math.