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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.

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About Line Height Calculator

1

Input Font Size

Enter the font size you plan to use for your body text (e.g., 18px).

2

Define Width

Specify the width of your content container or line length in pixels.

3

Select Tension

Choose between 'Tight', 'Optimal', or 'Loose' spacing preferences.

4

Copy Declaration

Grab the line-height value and apply it to your CSS body or paragraph tags.

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.

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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