Converters

PX to REM Converter

Converts PX, REM, and EM values in single or batch mode and also generates CSS snippets and spacing scales.

The PX/REM converter helps you move between fixed and relative CSS units so responsive design decisions stay consistent across a system.

Calculate PX, REM, and EM equivalents for a single value instantly.

Single conversion

Default browser font size is usually 16px. Frameworks like Tailwind CSS also use 1rem = 16px.

16px
16px

Font Size Preview

Quickly inspect how the entered pixel value looks in context.

The quick brown fox jumps over the lazy dog

Ready-to-use CSS output

Generate copy-ready CSS lines for the selected property.

CSS Code

.element { font-size: 1rem; /* 16px */ font-size: 1em; /* 16px */ }

Quick Reference Table

Click any value to load it into the single converter.

48px

Spacing Scale

Generate ready-made spacing variables from your root font size.

Spacing Scale

:root { --space-1: 0.25rem; /* 4px */ --space-2: 0.5rem; /* 8px */ --space-3: 0.75rem; /* 12px */ --space-4: 1rem; /* 16px */ --space-5: 1.25rem; /* 20px */ --space-6: 1.5rem; /* 24px */ --space-7: 2rem; /* 32px */ --space-8: 2.5rem; /* 40px */ --space-9: 3rem; /* 48px */ --space-10: 4rem; /* 64px */ --space-11: 5rem; /* 80px */ --space-12: 6rem; /* 96px */ }

What stands out in PX to REM Converter

  • Two-way conversion across PX, REM, and EM
  • Batch input mode with reference table support
  • CSS property output and spacing scale generation

Using PX to REM Converter, step by step

  1. Set the root font size

    Start with the base font-size your project uses so every conversion maps to the right scale.

  2. Enter single or batch values

    Convert one measurement or paste an entire list of size tokens separated by commas or line breaks.

  3. Reuse the results in code

    Copy the generated values into typography, spacing, or component sizing rules inside your CSS.

When PX to REM Converter fits best

  • Translating Figma pixel values into responsive CSS units
  • Migrating legacy fixed spacing tokens into a rem-based system
  • Keeping new component measurements aligned with a shared scale

Why do teams prefer rem-based sizing?

REM tracks the root font-size, which makes layouts more adaptable to accessibility settings and easier to scale consistently than pure pixel values.

PX to REM Converter: common questions

Is 1rem always 16px?

No. Sixteen pixels is a common default, but the root font-size can change per project or per user preference.

What is the main difference between EM and REM?

REM is based on the root element, while EM depends on the current or parent font-size and can compound in nested layouts.

Why is batch conversion useful?

It lets you standardize a full token list or spacing set in one pass instead of converting values one by one.

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PX/REM/EM Converter

Unit Differences

  • PX (Pixel): A fixed unit that does not scale when users change their browser settings.
  • REM (Root EM): A relative unit based on the root html element's font size. Default: 1rem = 16px.
  • EM: A relative unit based on the parent element's font size. Can compound when nested.

Single and Batch Conversion

Single mode: Enter a value to instantly see its PX, REM, and EM equivalents. Batch mode: Convert multiple comma-separated or line-separated values at once. Perfect for converting your entire design system's size values in one go.

Font Size Preview

See sample text rendered at your entered pixel value, giving you a visual preview of the actual font size.

CSS Code Generation

Generate ready-to-use CSS code for your converted values. Select a CSS property like font-size, margin, padding, width, height, or gap and get copy-ready code.

Reference Table

A quick reference table showing PX, REM, and EM equivalents from 1px up to your selected range. Values that are multiples of 4 (common spacing scale) are highlighted. Click any value to load it into the converter.

Spacing Scale

Generates consistent spacing scale CSS custom properties based on your root font size. Get ready-to-use --space-1: 0.25rem style variables for your projects.

Why Use REM?

Using REM is better for accessibility. When users change their browser's default font size, all REM-based measurements scale proportionally, respecting user preferences without breaking your design.