Line Height Calculator
Convert font size and line height between pixels, em and unitless values for readable, accessible typography.
Local processingLine Height Calculator
What is Line Height Calculator?
Line height controls the vertical space between lines of text and strongly affects readability. This calculator converts a font size and a line-height ratio into px, em and unitless CSS values.
How It Works
The pixel line height is font size multiplied by the ratio. The unitless value is the ratio itself, which is the recommended way to set line-height because it scales with inherited font sizes.
Common Use Cases
- Setting comfortable body text spacing
- Meeting WCAG text spacing recommendations
- Converting design handoff values to CSS
- Building consistent typography scales
Technical Details
Performs simple ratio arithmetic and reports all three CSS representations. No rendering or network access is involved.
How to Use
Enter your input above. The result updates automatically. Use the copy button to copy the result.
Privacy
All processing happens in your browser. Your data is never uploaded to any server.
FAQ
Which unit should I use in CSS?
A unitless line-height is usually best because it inherits proportionally. Pixels are useful when you need an exact fixed value.
Is my data uploaded to a server?
No. Everything runs locally in your browser. Your input never leaves your device.
Does Line Height Calculator work on mobile?
Yes. The interface is responsive and works in modern mobile browsers without installing an app.