TFT

Fluid Typography Calculator

Generate responsive clamp()-based fluid typography that scales smoothly between viewport breakpoints.

Viewport Range
Font Size Range
Line Height Range
Preview at Breakpoints

Mobile

16.4px

@375px viewport

Tablet

19.2px

@768px viewport

Desktop

21.0px

@1024px viewport

Large

24.0px

@1440px viewport

Live Preview

Mobile (375px): 16.4px

Tablet (768px): 19.2px

Desktop (1440px): 24.0px

Generated CSS
:root {
  /* Fluid Typography Scale */
  --fluid-font-size: clamp(16px, 0.0071vw + 13.71px, 24px);
  --fluid-line-height: clamp(1.5, 0.0003vw + 1.41, 1.8);
  
  /* Configuration */
  --min-viewport: 320px;
  --max-viewport: 1440px;
  --min-font-size: 16px;
  --max-font-size: 24px;
}
/* Fluid Typography */
font-size: clamp(16px, 0.0071vw + 13.71px, 24px);
line-height: clamp(1.5, 0.0003vw + 1.41, 1.8);
body {
    /* Fluid Typography */
  font-size: clamp(16px, 0.0071vw + 13.71px, 24px);
  line-height: clamp(1.5, 0.0003vw + 1.41, 1.8);
}

About Fluid Typography

Fluid typography uses CSS clamp() to create font sizes that scale smoothly between viewport breakpoints. This eliminates the need for multiple media queries and provides a more natural reading experience across all devices.

The clamp(min, preferred, max) function ensures your text never goes below a minimum size or above a maximum size, while scaling fluidly in between based on viewport width.

How It Works

The calculator uses linear interpolation to create a smooth scale:

preferred = slope × viewport + y-intercept
slope = (maxFont - minFont) / (maxView - minView)

This creates a linear relationship between viewport size and font size, ensuring smooth scaling across all screen sizes.

Best Practices

Accessibility First
Always set reasonable minimum and maximum values. Text should never be too small to read or so large it breaks the layout.
Respect User Preferences
Consider using relative units (rem) alongside clamp() to respect browser font size preferences and accessibility settings.

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