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CSS Tools

Free CSS Clamp Calculator

Enter minimum and maximum values plus viewport widths to generate a CSS clamp expression for fluid typography, spacing, or layout values.

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What is CSS Clamp Calculator?

CSS clamp sets a minimum value, a preferred fluid value, and a maximum value in one expression. It is commonly used for responsive font sizes and spacing because it can scale smoothly between mobile and desktop without writing several media queries.

quickAnswer

Calculate a responsive CSS clamp expression for fluid typography, spacing, or layout values. Enter minimum and maximum sizes with viewport ranges to generate a value that scales smoothly between them.

Last updated: 2026-06-11

limitations

  • Clamp() values are static once generated. They do not adapt to changes in the DOM, user interactions, or container dimensions. For layout-aware scaling, consider container query units instead.
  • The viewport-based preferred value may need adjustment at extreme screen sizes. Test the generated clamp value on very small and very large viewports to confirm the curve feels natural.
  • This tool uses viewport width (vw) for the preferred value. It does not account for container query units (cqw) or other newer CSS units that behave differently.

Sources:MDN Web Docs · W3C Specifications · jquery.app on GitHub

How to use this tool

  1. Enter the smallest and largest size you want the property to use.
  2. Enter the viewport width where the smallest value should start and the viewport width where the largest value should stop.
  3. Choose the CSS property you want to generate.
  4. Copy the clamp expression into your stylesheet and test it at mobile, tablet, and desktop widths.

What you can use it for

  • Create fluid headings without many media queries.
  • Scale spacing smoothly between mobile and desktop.
  • Copy a clamp value directly into CSS.

Use cases

Practical examples

example

Responsive heading size

A heading should be 32px on phones and 64px on desktop. The calculator creates one clamp value that scales between those points.

example

Fluid section spacing

A landing page needs smaller spacing on mobile and wider spacing on desktop. Use clamp for padding or gap values instead of multiple breakpoints.

Common mistakes

  • Using viewport ranges that do not match the actual layout.
  • Applying clamp to body text without checking readability.
  • Mixing px and rem values without a clear base size.

verification

  1. Inspect the element using browser DevTools and verify the clamp() value resolves to expected pixel values at minimum, mid-range, and maximum viewport widths.
  2. Resize the browser window slowly from mobile width to desktop width and confirm the property value transitions smoothly without jumps.

FAQ

Questions about CSS Clamp Calculator

Can I use clamp for more than font size?

Yes. It works for many length-based CSS properties, including margin, padding, gap, width, and border radius.

Does clamp replace media queries?

It can reduce many size-related media queries, but media queries are still useful when layout structure changes.

Should I use px or rem?

Both can work. Rem is often better for font sizes because it respects user font settings, while px is simpler for quick layout calculations.

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