REM to PX Converter

REMrem

Pixelspx

Base font size (default 16px):px

Common REM to PX conversions

0.5rem = 8px
0.625rem = 10px
0.75rem = 12px
0.875rem = 14px
1rem = 16px
1.25rem = 20px
1.5rem = 24px
1.75rem = 28px
2rem = 32px
2.5rem = 40px
3rem = 48px
3.5rem = 56px
4rem = 64px
4.5rem = 72px
5rem = 80px

About REM to PX Conversion

The conversion from rem (root em) to pixels (px) is important when you want to determine the exact pixel size based on the root font size. The rem unit is relative to the root font-size (usually 16px in most browsers), while px is an absolute unit. Converting rem to px helps to visualize or ensure consistency in design.

Formula for REM to PX Conversion

To convert rem to pixels (px), use the following formula:

px = rem * base font size

For example, if the rem value is 2rem and the base font size is 16px:

px = 2rem * 16px = 32px

When to Use PX vs REM

Use PX for:

Border widths and box shadows
Fixed-size decorative elements
Precise pixel-perfect designs
When you need exact measurements regardless of user settings

Use REM for:

Typography and font sizes
Layout spacing (margins, padding)
Responsive widths and heights
Elements that should scale with user preferences

Browser Support and Accessibility

While pixels are the most basic unit of measurement in digital displays, converting to REM units can provide better accessibility. Here's why the conversion between PX and REM matters:

Pixels are fixed and don't respect user font-size preferences
REM units scale with the root font size, improving accessibility
Modern browsers support both units perfectly
Converting between units helps bridge design and development workflows

Best Practices for Using Pixels

Use pixels for precise, non-scaling elements
Consider converting to REM for responsive designs
Keep a reference of common PX to REM conversions
Use pixels in image dimensions and border properties
Document your sizing decisions in your design system

CSS Implementation Example

/* Mixed usage of PX and REM */
.card {
  /* Fixed measurements in pixels */
  border: 1px solid #ccc;
  border-radius: 4px;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);

  /* Scalable measurements in REM */
  font-size: 1rem;      /* 16px */
  padding: 1.25rem;     /* 20px */
  margin-bottom: 2rem;  /* 32px */
}

.card-image {
  /* Fixed size elements */
  width: 300px;
  height: 200px;
}