Line-Height Calculator – Find the Optimal Line Spacing for Your Typography
Improve readability with perfectly calculated line spacing using our Line-Height Calculator. Enter your font size and column width to get recommended line-height values in px, em, or unitless — following best practices for body text and headings.
Optimal: 45-75 characters per line
Line-Height Results
Enter font size and click Calculate to see recommendations
Line-Height Best Practices
- Body text: 1.5-1.6 for optimal readability
- Headings: 1.1-1.4 (tighter for larger sizes)
- Measure: 45-75 characters per line is ideal
- Unitless values: Use unitless (1.5) instead of px for scalable, accessible typography
- Leading: Space between lines = line-height - font-size
CSS Tip: Always use unitless line-height values (e.g., 1.5) instead of pixels or ems for better inheritance and scalability across different font sizes.
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