Free Toolkit

Typography Units ConverterConvert between px, pt, em, rem, cm, mm, inches, and picas with configurable base font size.

Typography Units Converter illustration
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Typography Units Converter

Convert between px, pt, em, rem, cm, mm, inches, and picas with configurable base font size.

How to Use
1

Set base font size

Adjust the base font size slider if your root font size differs from the default 16px.

2

Enter a value

Type the size value to convert.

3

Select units

Choose source and target typography units.

What Is Typography Units Converter?

A typography units converter translates between the various measurement systems used in digital and print typography. Pixels (px) are the standard web unit. Points (pt) are traditional in print design (1 pt = 1/72 inch). Em and rem are relative units — em is relative to the parent font size, rem to the root font size (typically 16px). Physical units (cm, mm, inches) and picas (1 pc = 12 pt) bridge print and digital contexts. The configurable base font size ensures accurate em/rem conversions matching your project's settings.

Why Use Our Typography Units Converter?

  • Configurable base font size for accurate em/rem calculations.
  • Bridges print (pt, pc, in) and digital (px, em, rem) typography.
  • Essential for web designers and developers.
  • Real-time conversion with reference table.
  • Completely client-side.

Common Use Cases

Web Development

Convert between px, em, and rem for responsive typography.

Print Design

Convert between points, picas, and physical measurements.

CSS Authoring

Calculate rem values from pixel-based design specs.

Cross-Platform Design

Ensure consistent typography across web, print, and mobile.

Technical Guide

Typography measurement at 96 DPI (CSS reference pixel): • 1 px = 1/96 inch (CSS definition) • 1 pt = 1/72 inch = 96/72 px = 1.333 px • 1 pc (pica) = 12 pt = 16 px • 1 em = parent font size (default: 16px) • 1 rem = root font size (default: 16px) • 1 in = 96 px (CSS), 72 pt • 1 cm = 96/2.54 ≈ 37.8 px • 1 mm = 96/25.4 ≈ 3.78 px The CSS pixel is defined as 1/96 of an inch, regardless of the physical screen resolution. On high-DPI screens, one CSS pixel may correspond to multiple physical pixels. Em and rem are proportional units. At the default 16px base, 1rem = 16px, 0.875rem = 14px, and 1.25rem = 20px. Using rem for font sizes enables accessible scaling when users change their browser's default font size.

Tips & Best Practices

  • 1
    At 16px base: 1rem = 16px. The "62.5% trick" (html { font-size: 62.5% }) makes 1rem = 10px for easier math.
  • 2
    1pt ≈ 1.33px. Print's 12pt body text ≈ 16px on screen.
  • 3
    Use rem for accessible web typography — it respects user browser settings.
  • 4
    Pica (pc) is still used in traditional typesetting: 1 pc = 12 pt = 16 px.

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Frequently Asked Questions

QHow do I convert px to rem?
Divide pixels by the root font size (typically 16). For example, 24px ÷ 16 = 1.5rem.
QWhat is the difference between em and rem?
Em is relative to the parent element's font size, which can compound. Rem is always relative to the root (html) element's font size, making it more predictable.
QHow many points in a pixel?
At the CSS standard of 96 DPI: 1 px = 0.75 pt, or equivalently, 1 pt = 1.333 px.
QWhat is a pica?
A pica is a traditional typographic unit equal to 12 points or 1/6 of an inch. In CSS at 96 DPI, 1 pica = 16 pixels.
QWhy is the default font size 16px?
Major browsers set 16px as the default body font size. This became the de facto standard for calculating rem values in CSS.

About Typography Units Converter

Typography Units Converter is a free online tool from FreeToolkit.ai. All processing happens directly in your browser — your data never leaves your device. No registration required. No ads. Just fast, reliable tools.