PX to REM Converter

What is PX to REM Conversion?

PX (pixels) is a fixed CSS unit — 24px is always 24px regardless of the user's browser settings. REM (Root EM) is a relative unit that scales based on the root element's font size (typically 16px in browsers). Converting PX to REM makes your CSS flexible and accessible.

The formula is simple: REM = PX ÷ Base Font Size. With the default base of 16px, 24px becomes 1.5rem, 32px becomes 2rem, and so on.

How to Use the PX to REM Converter

1. Enter your pixel value in the Pixel Value (px) field.
2. Set the Base Font Size — leave it at 16 unless your project uses a custom root font size.
3. The REM result appears instantly with the full formula shown.
4. Click Copy to copy the result to your clipboard.
5. Click Reset to clear all fields and start over.

Why Use REM Instead of PX?

• Accessibility: REM scales when users increase their browser font size in accessibility settings. PX does not.
• Responsive design: Changing the root font size with a media query scales your entire layout proportionally.
• Consistency: REM gives you a single control point — adjust the root size and everything adjusts with it.
• Modern CSS best practice: Most modern style guides and frameworks recommend REM for font sizes and spacing.

PX to REM Conversion Table

Reference table using the standard 16px base font size.

REM vs PX — When to Use Each

Use REM for font sizes, padding, margin, and layout spacing that should scale with user preferences. Use PX for borders, box shadows, and elements where an exact fixed size is required regardless of the user's font settings.