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CSS Clamp() Calculator

Build fluid responsive typography and spacing with clamp(). Min, max, and viewport ranges, copy CSS.

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Build fluid responsive typography and spacing with CSS clamp(). Set min and max font sizes and the viewport widths they apply at, and the tool produces the clamp() string ready to copy. Includes a viewport simulator slider.

When to use it

  • 1Replacing media-query font-size breakpoints with one fluid clamp().
  • 2Designing a hero size that grows smoothly from mobile to desktop.
  • 3Auditing existing clamp() values by reverse-engineering them in the visual UI.

How it works

  1. 1

    Set min/max sizes and viewports

    Min and max in px or rem. Min and max viewport widths to lerp between.

  2. 2

    Read the clamp()

    The output is a copy-ready clamp() expression with named stop comments.

  3. 3

    Simulate a viewport

    Drag the simulator slider to see how the size scales without resizing your browser.

Frequently asked

Browser support?

clamp() works in every modern browser since 2020. No fallback needed for current users.

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