Line Height Calculator - Calculate Line Height

Calculate optimal line-height for typography

Custom

Result

Line Height (px): 24.00px
Line Height (unitless): 1.50
Line Height (em): 1.50em
Line Height (%): 150%
Leading (distance): 8.00px

Preview

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CSS: font-size: 16px; line-height: 1.5;

Line Height Calculator Online - Optimal CSS line-height calculator for typography for free

Tan Phat Digital's Line Height Calculator tool helps you calculate the optimal line-height for typography in web design. Adjust font-size from 10px to 72px and line-height ratio from 1 to 3. Preview realtime with sample text to see results immediately. Displays line-height in multiple formats: pixels, unitless, em, and percentage. Calculate leading (space between lines) automatically. 4 popular presets: Tight (1.25), Normal (1.5), Relaxed (1.75), Loose (2). Copy values ​​with one click. Correct line-height improves readability significantly, especially important for body text and long-form content.

Outstanding features

Adjust font-size from 10px to 72px with slider
Adjust the line-height ratio from 1 to 3 with an accuracy of 0.05
4 popular presets: Tight, Normal, Relaxed, Loose
Preview realtime with actual sample text
Display line-height in 4 formats: px, unitless, em, %
Calculate leading (line spacing) automatically
Copy each value with one click
Displays ready-to-use CSS code
Completely offline processing on the browser
Completely free, unlimited use

Why is line-height important in typography and UX?

Line-height (or leading in traditional typography) is one of the most important factors affecting the readability of text. Line-height is too tight, causing the lines to stick together, making it difficult for the eye to follow and causing fatigue when reading. Line-height is too loose (wide) causing the connection between lines to be lost, making it difficult for readers to recognize which line is next. Research shows that the optimal line-height for body text is 1.4-1.6 (140%-160% of font-size). Headings can use line-height tighter (1.1-1.3) because they are usually short and need to be more compact. Line-height also affects vertical rhythm - the consistency of spacing throughout the page layout.

Benefits when used

  • •Significantly improved readability for body text
  • •Reduce eye strain when reading long-form content
  • •Create consistent vertical rhythm in design
  • •Professional and polished typography
  • •Better accessibility for users
  • •Consistent spacing across different font sizes
  • •Easily test and compare line-height values ​​
  • •Save time with presets and previews

Detailed instructions on how to calculate optimal line-height

  1. 1Set the font-size you are using using the slider (10-72px)
  2. 2Adjust line-height ratio using slider or click preset
  3. 3View the preview with sample text to evaluate readability
  4. 4View results in formats: px, unitless, em, %
  5. 5See leading (distance between baseline of 2 lines)
  6. 6Copy the appropriate value and paste it into CSS

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