CSS Clamp Calculator — Build Responsive Font Sizes

Easily generate clamp() CSS values to create scalable typography and spacing. Preview how it behaves across screen sizes and copy the CSS output.

Clamp() Input
Min Size (rem)
Preferred Size (rem) at 1000px
Max Size (rem)
Viewport Base (px)
CSS Output
1
Mobile (375px)
Tablet (768px)
Desktop (1440px)

Design Smarter, Not Harder

Stop guessing breakpoints. With clamp(), you can define scalable typography that feels natural across mobile, tablet, and desktop devices.

When to Use This Tool

  • 📱 Responsive font sizing in modern CSS
  • 🧱 Spacing units that adapt across screen sizes
  • 🎯 Designing without media queries
  • 💡 Prototyping layouts with fluid constraints

Output Preview

Below, the font size preview updates across common device widths using your custom clamp() expression. Try tweaking the numbers and watch it adapt live.

Frequently Asked Questions (FAQs)

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