About the Free Rem to Pixel Converter

The Rem to Pixel Converter converts between CSS rem and px values using your base font size. It works in both directions, offers one-click results, and includes a quick reference table so you can see common sizes at a glance.

Key Features

• Two-Way Conversion: rem → px and px → rem, switchable with one click.
• Custom Base Font Size: The base defaults to 16px (browser default) but you can use any size from 12px to 24px or type your own.
• Preset Bases: Quick buttons for 12px, 14px, 16px, 20px, and 24px.
• Quick Reference Table: Shows common rem steps (0.25rem → 3rem) converted at your current base.
• One-Click Copy: Copy the exact result to your clipboard.

What Is rem Units?

A rem (root em) is relative to the font size of the document root — the <html> element. That makes rem units far more predictable than em, which compounds relative to each parent element. With a 16px root, 1rem = 16px, 1.5rem = 24px, and so on. Responsive designs often change the root size with media queries, which is why designers convert rem to px when checking how their layouts scale.

How It Works

1. Choose the conversion direction (rem → px or px → rem).
2. Enter your value.
3. The result appears instantly.
4. Set your base font size and use the reference table for quick scans.
5. Copy the result with the copy button.