What is CSS clamp() and when should I use it?

CSS clamp(min, preferred, max) locks a value between a minimum and maximum while letting it scale fluidly in between. Use it for font sizes, padding, gap, and margins whenever you want responsive values that scale with the viewport without needing media queries.

What units does this CSS Clamp Calculator support?

You can enter values in px or rem. The calculator outputs the clamp() formula using vw-based preferred values and rem for min/max — the recommended approach for accessible, scalable designs.

How is the clamp() preferred value calculated?

The preferred value uses linear interpolation: slope = (maxValue - minValue) / (maxViewport - minViewport). The preferred value = slope * 100vw + intercept, where intercept = minValue - slope * minViewport. This tool does that math instantly so you never have to.

Can I use clamp() for properties other than font-size?

Yes — clamp() works on any numeric CSS property. Common uses include padding, margin, gap, width, height, border-radius, and line-height. Just enter your desired value range and use the output in any property.

Is browser support for clamp() production-ready?

Yes. CSS clamp() has global browser support above 97% as of 2024, covering all modern browsers including Chrome, Firefox, Safari, and Edge. It is safe to use in production without any polyfill.

Free CSS Tool

Generate CSS clamp() Values
Without the Math

Stop calculating fluid responsive values by hand. Enter your min/max sizes and viewport widths — get a perfect clamp() formula ready to paste into your CSS.

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Instant Formula

Enter min size, max size, and breakpoints. Get a valid clamp() value in real time with no manual slope calculations needed.

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Live Preview

See exactly how your value scales across viewport widths with an interactive chart before you copy.

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Copy in One Click

Copy the full clamp() value ready to use in font-size, padding, gap, margin, or any CSS property.

Quick presets

Unit:

Min Value(px)

Max Value(px)

Min Viewport (px)

Max Viewport (px)

CSS Output100% browser compatible

clamp(1rem, 0.8333vw + 0.8333rem, 1.5rem)

Min (clamp floor)

1rem

Preferred (fluid)

0.8333vw + 0.8333rem

Max (clamp ceiling)

1.5rem

Value at viewport widths

320px

16.00pxmin

480px

17.33px

640px

18.67px

768px

19.73px

1024px

21.87px

1280px

24.00pxmax

1440px

24.00pxmax

Paste into any CSS property: font-size, padding, gap, margin, and more.

Frequently Asked Questions

Everything you need to know about CSS Clamp Calculator.

Generate CSS clamp() ValuesWithout the Math

Instant Formula

Live Preview

Copy in One Click

Frequently Asked Questions

Generate CSS clamp() Values
Without the Math