Line Height Calculator — CSS Leading Ratio Tool

Convert design line spacing (px) to line-height multiplier.

About this tool

This tool converts design leading (px) to line-height multiplier in one click. Three features: 1) Enter font size (px) and desired line spacing (px) for multiplier, 2) Convert design specs to CSS, 3) Useful for typography line spacing design.

Tool interface

line-height (multiplier) —
CSS —

CSS line-height — from design leading to ratio

Why line-height matters

Line-height (leading) is the vertical rhythm between lines of text. Too tight and lines collide; too loose and readers lose the next line. Body copy often lands around 1.5–1.7 unitless; headings around 1.2–1.3.

Unitless vs px

Prefer a unitless multiplier (line-height: 1.5) so spacing scales when font-size changes. Fixed px is fine for single-size UI chips, but fights fluid type and inheritance.

ratio = desired line spacing (px) ÷ font size (px)

Example: 24px leading ÷ 16px font → line-height: 1.5

Tailwind leading-* handoffs

Design tools often specify leading in px while Tailwind uses leading-6, leading-relaxed, etc. Convert the px pair to a ratio first, then pick the closest utility — or set an arbitrary value like leading-[1.55]. This calculator removes the guesswork between Figma and CSS.

Quick workflow

  1. Enter font size (px) from the design spec
  2. Enter desired line spacing / leading (px)
  3. Copy the unitless ratio into CSS or Tailwind

Usage

  1. Enter font size (px) and desired line spacing (px)
  2. line-height multiplier is calculated instantly
  3. Use result for CSS line-height property

When to use

Converting design specs to CSS, typography line spacing.

Examples

16px font, 24px spacing → line-height: 1.5

FAQ

What does unitless line-height mean?

Multiplier of font size. 1.5 = 1.5× font height. Inherits relatively.

Line spacing vs line-height?

Same concept. Design uses 'leading', CSS uses line-height. spacing ÷ font-size = multiplier.

Recommended line-height?

Body 1.5–1.8. Headings 1.2–1.4. This tool converts design leading (px) to multiplier.

How to calculate line-height from px?

Desired line height (px) ÷ font size (px) = multiplier. E.g. 24px ÷ 16px = 1.5.

What is line-height: normal?

Browser default (~1.2). Varies by font. Better to set explicitly.

Typography line spacing tips?

Body 1.5–1.8 for readability. Headings 1.2–1.4. This tool converts px leading to multiplier.

What is design leading?

Line-to-line spacing. In Figma/Illustrator as 'leading'. Convert px to line-height multiplier.

Inherit line-height?

Unitless (1.5) inherits relatively. px is fixed. Prefer unitless for scaling.

Align multi-line text spacing?

Use same line-height multiplier. Consistent visual spacing across font sizes.

How to use line-height calculator?

Enter font size (px) and desired line spacing (px). Get line-height multiplier instantly.

Is Line Height Calculator — CSS Leading Ratio Tool free?

Free to use, no sign-up required.

Is data sent to a server?

Data stays on your device; we do not store it on our servers.

Supported browsers?

Tested on recent Chrome, Edge, Firefox, and Safari.

Offline use?

Core features work offline after the first load.

vs CLI or desktop apps?

Line Height Calculator — CSS Leading Ratio Tool is an install-free online alternative to CLI or desktop apps.

When to use it?

Use it when: Converting design specs to CSS, typography line spacing.

Usage example?

Example: 16px font, 24px spacing → line-height: 1.5

Main features?

px spacing → multiplier, Font size based, Instant calculation

How is this different from similar tools?

Line Height Calculator — CSS Leading Ratio Tool runs in the browser with no install—ideal for quick checks before heavier CLI or IDE workflows.

Search keywords

line height calculator, css line height, leading css, line-height ratio, typography line spacing

Basic workflow

  1. Enter font size (px) and desired line spacing (px)
  2. line-height multiplier is calculated instantly
  3. Use result for CSS line-height property

Practical use cases

  • Converting design specs to CSS, typography line spacing.
  • This tool converts design leading (px) to line-height multiplier in one click. Three features: 1) Enter font size (px) and desired line spacing (px) for multiplier, 2) Convert design specs to CSS, 3) Useful for typography line spacing design.
  • px spacing → multiplier
  • Font size based

Privacy & data handling

Data stays on your device; we do not store it on our servers.

Things to watch out for

  • Treat Line Height Calculator — CSS Leading Ratio Tool as a quick check — re-verify critical values in your editor or CI before shipping.
  • If a browser extension breaks the page, retry in a private window with extensions disabled.
  • Very large pastes can freeze a tab briefly — wait for the result before closing the tab.

Related guides

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Tool set

Typography Set