PX to REM Converter
Convert px to rem with a base-size slider. Live conversion table and copy-ready CSS snippet.
Quick answer: Convert px to rem with a base-size slider. Live conversion table and copy-ready CSS snippet.
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Frequently asked questions
- How do I convert px to rem?
- Type the pixel value into the input. The rem value appears immediately based on the base size you've chosen (default 16). Use the slider to change the base.
- What is rem in CSS?
- A rem (root em) is a unit relative to the root element's font size. With the default 16 px root, 1 rem equals 16 px — so spacing scales when users change their browser's text size.
- What base font size should I use?
- 16 px is the browser default and the most respectful choice — it scales with user preferences. Some teams use 10 px (the "62.5%" trick) to make the math easier, but it overrides user settings.
- Is rem better than px?
- Rem is better for typography and layout that should respect the user's text-size preference. Px is fine for borders, hairlines and tiny details that should not scale.
- How do I convert rem to px?
- Multiply the rem value by your root font size (default 16). 1.25 rem at 16 px root is 20 px.
- How do I make typography responsive?
- Set body font-size in rem, then use rem values for all text and spacing. Combine with CSS clamp() for fluid scaling between breakpoints.
- What's the difference between em and rem?
- em is relative to the parent element's font size; rem is relative to the root. rem is more predictable for layout because it doesn't compound through nested elements.
- Why do my rem values look weird?
- Round to 2–3 decimals for clean values. If you need a perfect pixel grid, use a base where px values divide cleanly — 16 works well.
- Can I generate a px-to-rem table?
- Yes. The table on the right shows common px values and their rem equivalents. Copy any row's CSS snippet with one click.
- Is this px to rem converter free?
- Yes — free, no signup, no limits.