Perfect your website's vertical rhythm with our Line Height Calculator. Readability is heavily influenced by 'leading'—the vertical space between lines of text. If lines are too close, the text feels cramped; if they are too far apart, the eye struggles to find the next line. Our calculator uses established design principles to determine the optimal line height based on your font size and the width of your content block. By balancing these three variables, you can create a reading experience that feels effortless and naturally balanced. Experiment with different 'tightness' levels and see the results instantly in an interactive text preview. Copy the unitless line-height values to ensure your typography remains responsive and scales perfectly across all devices.
Line Height Calculator
Achieve perfect vertical rhythm and reading comfort
Spacing Parameters
Balance font and container size
Calculated Leading
Unitless CSS value
Readability Simulation
Previewing at 18px font size
The Art of Typographic Rhythm
The vertical distance between lines of text is known as leading. It is one of the most critical factors in determining how comfortable a text is to read. When leading is too tight, the eye struggles to track from the end of one line to the beginning of the next. Conversely, when it is too loose, the connection between lines is lost, and the text begins to feel like a series of disjointed fragments.
Modern web design favors unitless line-height values because they inherit properly. Setting a line-height of 1.61 means that the space between lines will always be 1.61 times the current font size, ensuring consistency across different devices and user settings.
Line Height Calculator
Calculate the ideal line height for your body text. Balance font size and line length for maximum readability using the Golden Ratio principle.
Input Font Size
Enter the font size you plan to use for your body text (e.g., 18px).
Define Width
Specify the width of your content container or line length in pixels.
Select Tension
Choose between 'Tight', 'Optimal', or 'Loose' spacing preferences.
Copy Declaration
Grab the line-height value and apply it to your CSS body or paragraph tags.
Key Features
Dynamic Ratio Input
Adjust font size and container width to see the impact on vertical spacing.
Unitless Output
Generates modern, unitless CSS line-height values for better responsiveness.
Golden Ratio Integration
Optionally calculate leading using the Golden Ratio for classical balance.
Readability Preview
Fine-tune spacing while looking at a multi-paragraph text simulation.
Frequently Asked Questions
For most body text, a unitless line-height between 1.5 and 1.6 provides the best balance of readability and aesthetics.
Unitless values (like '1.5') are relative to the font size, making them much more flexible and responsive than fixed values like 'px' or 'pt'.
Yes. Longer lines of text generally require more vertical spacing (higher line-height) to help the reader's eye track the next line correctly.
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