ATIO

PX to REM Converter

Convert pixels to REM units for responsive CSS design

Result:

1 rem

Quick Reference (Base: 16px)

8px
= 0.500rem
12px
= 0.750rem
14px
= 0.875rem
16px
= 1.000rem
18px
= 1.125rem
20px
= 1.250rem
24px
= 1.500rem
32px
= 2.000rem
48px
= 3.000rem
64px
= 4.000rem

CSS Code:

/* Instead of: */
font-size: 16px;

/* Use: */
font-size: 1rem;

Why Use REM Instead of PX?

  • ✅ Accessibility: Respects user's browser font size settings
  • ✅ Responsive Design: Scales proportionally across devices
  • ✅ Maintainability: Change base font size to scale entire design
  • ✅ Best Practice: Recommended by modern CSS standards

Understanding PX to REM Conversion

REM (Root EM) is a CSS unit relative to the root element's font size. By default, browsers set the root font size to 16px, making 1rem = 16px.

Conversion Formula

REM = Pixels ÷ Base Font Size (usually 16)

Common Use Cases

  • Font Sizes: Use REM for all typography
  • Spacing: Margins and padding scale with font size
  • Layout: Container widths and heights
  • Media Queries: Responsive breakpoints

PX vs REM vs EM

  • PX: Absolute unit, doesn't scale
  • REM: Relative to root font size
  • EM: Relative to parent element font size

✅ Best Practice:

Use REM for font sizes and spacing, PX for borders and small details, and % or viewport units for layout widths.

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