Clamp Generator

Generate responsive font-size clamp() CSS.

Fluid Typography Clamp Generator

Min Size (px)
Max Size (px)
Viewport Min (px)
Viewport Max (px)
Viewport unit
Decimals
Output unit
Property
Presets
Helpers

Formula: clamp(min, calc(slope * 100vw + intercept), max). Sizes are entered in px; pick rem to get the same values divided by 16.

Result

font-size: clamp(16px, calc(0.833vw + 13.333px), 24px);

Tailwind (arbitrary value):

text-[clamp(16px,0.833vw+13.333px,24px)]
Show Pieces
min: 16px
max: 24px
slope: 0.833vw
intercept: 13.333px

Live Preview

W: 1440px • H: 900px
Simulate width (px)

Try resizing with the sliders above.

Fluid sample: The quick brown fox jumps over the lazy dog 0123456789, AàÂБвÇçÊêĞğÎîÑñÖöŞşÜüŸ.

The simulator scales down to fit the panel; CSS values still use the exact simulated width/height in calculations.

CSS clamp() Generator for Fluid Typography

A CSS clamp() generator produces fluid typography and spacing values using the clamp(min, preferred, max) function. The clamp value scales smoothly between a minimum and maximum based on the viewport width, eliminating multiple @media query breakpoints for font sizes and spacing.

This free tool calculates the correct viewport-based slope and intercept so your font sizes and spacing values scale perfectly across all screen sizes, from mobile to large desktop.

Why use CSS clamp() for fluid typography?

  • No breakpoints needed: One clamp() value replaces three or four @media query overrides for a single font-size property.
  • Smooth scaling: Text grows and shrinks continuously as the viewport changes, not in jumps at fixed breakpoints.
  • Smaller CSS output: Fewer media queries mean a lighter stylesheet and faster page rendering.
  • Design system ready: Use clamp() values in your Tailwind CSS config or CSS custom properties for a fully fluid type scale.

How to use the CSS Clamp Generator

  1. Set your minimum font size (e.g. 16px) and the viewport width where it starts (e.g. 320px).
  2. Set your maximum font size (e.g. 24px) and the viewport width where it stops growing (e.g. 1280px).
  3. The tool calculates the clamp() expression including the correct vw slope and intercept.
  4. Preview the live scaling behavior and copy the generated CSS value.

Using clamp() in Tailwind CSS

You can use the generated clamp() value directly in your Tailwind configuration or as an arbitrary value in templates:

  • In tailwind.config.js: add it under theme.fontSize as a named custom value.
  • In a template: text-[clamp(1rem,2.5vw+0.5rem,1.5rem)] using Tailwind JIT arbitrary value syntax.

Browser support for clamp()

The clamp() function is supported in all modern browsers: Chrome 79+, Firefox 75+, Safari 13.1+, and Edge 79+. It covers more than 97% of global browser usage. No fallback or polyfill is needed for any project that does not support Internet Explorer.

Fluid spacing with clamp()

The same technique applies to spacing, not just typography. Use clamp() for padding, margin, gap, and width values to create fully fluid layouts that respond to the viewport without any media queries.

Picking the typeface too? The fonts directory lists free font sources and says which ones allow commercial use and webfont embedding.

Frequently Asked Questions

How do I calculate a CSS clamp() for fluid font size?

Choose the minimum size and the viewport width where it applies, then the maximum size and the viewport width where growth stops. The slope is (max minus min) divided by (viewport max minus viewport min), expressed per 1vw, and the intercept is min minus slope times viewport min. The generator writes clamp(min, calc(slope vw + intercept), max) for you and shows the pieces.

Should I use px or rem in clamp()?

rem respects the browser font size a user may have enlarged, so it is the accessible choice for typography. Pick rem in the output unit selector and every fixed length is divided by 16, the default root size. The vw part stays the same because it is relative to the viewport, not to the font size.

Why does the preview not change when I resize my browser?

The preview simulates a viewport with the sliders instead of relying on your real window, so you can test 320px or 2400px without resizing anything. The clamp() value is evaluated at the simulated width, or at the simulated height for vh, vmin and vmax.

How do I use the clamp() value in Tailwind CSS?

Copy the Tailwind line: text-[clamp(1rem,0.833vw+0.833rem,1.5rem)] works as an arbitrary value in any template, and the generator writes [font-size:...] for other properties. For a reusable scale, add the clamp() expression under theme.fontSize in tailwind.config.js.

Can clamp() be used for spacing, not only text?

Yes. Pick padding, margin-top, width or height in the property selector and the same expression scales spacing fluidly between two viewport widths, which removes media queries for layout gutters and section padding.

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