Convert CSS pixels to REM, EM, and Percentage units effortlessly. Build accessible, responsive websites with the correct relative units.
In modern web development, using relative units like REM (Root EM) is crucial for accessibility and responsiveness. Unlike Pixels (px), which are fixed units, REM units scale based on the root font size defined in the browser or the HTML tag.
The default browser font size is 16px. Ensure the"Base Size" input is set to 16 (or your custom base).
Type the pixel value from your design file (Figma, Sketch) into the"Pixels" field.
Click the copy icon next to the REM or EM value and paste it into your CSS.
This tool is indispensable for professionals in the digital space:
Translating design specs into accessible CSS code efficiently.
Understanding how pixel-perfect designs translate to code.
Ensuring websites meet WCAG guidelines for text resizing.
The calculation is straightforward: Pixels / Base Size = REM.
Relative to the root (html) element font size. Consistent across the entire page. Best for font sizes, margins, and padding.
Relative to the parent element's font size. Good for component-level scaling (e.g., padding inside a button scaling with the button text).
Instant, browser-based execution with zero configuration and zero delays.
Type your content, enter values, paste code, or select your files in the tool workspace above.
All algorithms run client-side in milliseconds directly inside your browser. No server waiting time.
Get formatted results, copy to clipboard, or download files immediately with no watermarks or restrictions.
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Your data and files process locally in your browser. Nothing is saved or stored.
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Everything you need to know about using this free online tool.
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