PX to REM Converter
Convert fixed pixels to scalable REM units
💡 Calculation: 16px ÷ 16 = 1.0000rem
Quick Reference
| Pixels | REM | Common Use |
|---|---|---|
| 8px | 0.500rem | Small spacing, icons |
| 12px | 0.750rem | Caption text |
| 14px | 0.875rem | Small body text |
| 16px | 1.000rem | Base body text |
| 18px | 1.125rem | Large body text |
| 20px | 1.250rem | Small headings |
| 24px | 1.500rem | H4/H5 |
| 32px | 2.000rem | H3 |
| 40px | 2.500rem | H2 |
| 48px | 3.000rem | H1 |
| 64px | 4.000rem | Hero text |
Batch CSS Converter
Paste CSS with px values and convert them all to rem instantly
Why use REM?
REM units scale based on the root font size, making your design more accessible and responsive. Users can adjust their browser's font size, and REM units will scale accordingly. This tool assumes the standard browser default of 16px = 1rem.
What is PX to REM Conversion?
Pixels are absolute; they don't respect user preferences. REM units scale with the root font size, making your designs accessible and responsive. Converting from pixels to REM is essential for modern CSS.
When a user sets their browser to large text for accessibility, pixel-based layouts stay stubbornly fixed. REM-based designs scale proportionally, respecting user choice and improving readability for everyone.
Why Convert PX to REM?
WCAG accessibility guidelines recommend relative units for text and spacing. REM units are relative to the root element's font size (typically 16px), allowing entire layouts to scale when users adjust their preferences.
Beyond accessibility, REM simplifies responsive design. Instead of writing multiple breakpoints, your layout scales naturally. Design systems built on REM are more maintainable and predictable.
How the Conversion Works
The math is straightforward:
REM = Pixels ÷ Base Font Size
With a 16px base (browser default), 24px becomes 1.5rem. Change the base to 20px, and 24px becomes 1.2rem. Our tool lets you adjust the base font size to match your project's settings.
For batch conversion, paste entire CSS blocks and we'll convert all pixel values at once.
Common Use Cases
- Building accessible typography systems
- Creating scalable component libraries
- Converting legacy CSS to responsive units
- Design system token generation
Pro Tip
Set your root font-size to 62.5% (10px) for easier math: 1.6rem = 16px, 2.4rem = 24px. Clean numbers, easy calculations.
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