Quickly calculate ideal line height based on font size. Adjust line spacing, preview how it looks, and copy CSS code with unitless, px, rem, or em options.
Test contrast ratio between foreground and background colors. Ensure WCAG AA/AAA accessibility compliance with live preview and pass/fail indicators.
Instantly calculate matching width or height while maintaining original aspect ratio. Includes visual preview to understand scaling better.
Convert pixel values to rem based on root font size and vice versa. Includes live preview and ready-to-use CSS code snippet for your responsive designs.
Generate responsive CSS clamp() values for typography and spacing. Preview how the font size looks across mobile, tablet, and desktop screen widths with copy-ready CSS output.
Calculate and preview column widths and span values in CSS Grid. Separate output for container and child elements with editable column and gap controls.
Convert CSS units interactively with support for px, rem, em, %, vh, and vw. Includes live preview, custom root font and viewport size, and CSS output.
Proper line spacing improves readability, balance, and visual rhythm in your typography. Whether you're building UI or writing content, this tool helps you find the right fit.
The calculator gives you a font-size
and a line-height
that you can copy-paste directly into your stylesheet.
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