Ready to generate
Set your values and click Generate// build fluid clamp() values without the math
Generate responsive CSS clamp() expressions for font sizes, spacing, and layouts. Set min/max values and viewport breakpoints — get instant fluid CSS output.
Ready to generate
Set your values and click GenerateSelect the CSS property (font-size, padding, etc.) and your preferred unit (px, rem, em).
Enter the smallest and largest values you want at different screen sizes.
Set the min and max viewport widths where scaling begins and ends.
Click Generate — get the clamp() expression and paste it directly into your CSS.
The CSS clamp() function lets you create values that scale fluidly between a minimum and maximum as the viewport width changes — no media queries needed. This tool calculates the precise slope and intercept required to make that happen correctly.
clamp(min, preferred, max) returns a value between a minimum and maximum, with a fluid middle value that scales with the viewport. It replaces multiple media query breakpoints with a single, elegant declaration.
The preferred value is a viewport-relative expression (e.g. 1.5vw + 12px) that scales linearly as the screen width changes. Below the min viewport it clamps to the minimum; above the max viewport it clamps to the maximum.
Using rem is recommended for font sizes. It respects the user's browser font-size preferences and scales correctly when users zoom in or change default sizes for accessibility.
Popular choices are 320px (small mobile) to 1280px (laptop), or 375px to 1440px (modern devices). Use whatever matches your project's design breakpoints for the most predictable behavior.
Yes — clamp() has excellent browser support and works in all modern browsers including Chrome, Firefox, Safari, and Edge. It does not require a polyfill for any currently supported browser.
The same technique works for any numeric CSS property: padding, margin, gap, border-radius, etc. Just select the appropriate property from the dropdown and enter your desired min/max values.
When using rem or em units, the tool needs to know the base font size (usually 16px) to correctly convert between rem and px for the internal slope calculation. If your site sets a different root size, update this field.
The batch output generates a full modular type scale — xs through 5xl — using your current viewport settings as a base. It's a quick way to create a cohesive, fluid type system in one click.
A CSS clamp generator is a tool that calculates the exact clamp() expression needed to make any CSS value — font size, padding, margin, gap, border-radius — scale fluidly between two fixed points as the viewport width changes. Instead of manually computing the slope and intercept of the linear interpolation, you simply enter your desired minimum and maximum values, define the viewport breakpoints, and get the complete CSS output instantly.
This eliminates one of the most tedious parts of building responsive layouts: writing separate media queries for every breakpoint. With a single clamp() declaration, your values transition smoothly across the entire range of screen sizes you define.
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The clamp() function takes three arguments: clamp(MIN, PREFERRED, MAX).
vw units) that scales with the viewportThe preferred value is where the math comes in. To interpolate linearly between your min and max values across a specific viewport range, you need to calculate a slope and an intercept. If your font should be 16px at 320px wide and 24px at 1280px wide, the slope is (24 - 16) / (1280 - 320) = 0.00833 per pixel, which converts to 0.833vw. The intercept ensures the line passes through your target points.
The final expression looks like: clamp(16px, 0.833vw + 13.33px, 24px). Doing this math manually for every value in your design system is error-prone — which is exactly why a generator like this one exists.
The most common application for clamp() is fluid typography. Traditional responsive typography uses breakpoints: a heading might be font-size: 24px on mobile and font-size: 40px on desktop, with an abrupt jump between them. With clamp(), the font size transitions smoothly, creating a far more polished reading experience.
A well-designed fluid type scale also improves accessibility. Users who increase their browser's default font size or use zoom get appropriately scaled text that doesn't break the layout, because the whole system scales proportionally rather than jumping between hardcoded values.
Once you understand how clamp() works for typography, you can apply the same approach to any spatial property in your design system:
Using clamp() for spacing creates a more harmonious design because every element scales proportionally — the relationship between font size, padding, and margin stays consistent across all viewport widths.
For font sizes, rem is almost always the better choice. Using rem means your clamp values are relative to the user's browser default font size (typically 16px), which respects accessibility preferences. A user who sets their browser to display text 20% larger will see your fluid type scale also adjust accordingly.
For spacing, padding, and layout values, px is often more predictable — you generally don't want a component's padding to change just because the user has changed their browser font size preference.
This generator supports both approaches. When you select rem or em, it internally converts to px for the slope calculation, then presents the final values in your chosen unit. The root font size field (default 16px) lets you override the base conversion factor if your project uses a different root size.
A typographic scale is a set of font sizes with a consistent mathematical ratio between each step. Common ratios include the "Major Third" (1.25×) and the "Perfect Fourth" (1.333×). The batch export feature in this tool generates a complete fluid scale — from xs to 5xl — using your current min/max settings as the base, then applying scale ratios upward and downward.
This gives you a ready-to-paste CSS block that you can drop into a :root {} declaration, creating a fluid design token system that scales across all breakpoints without a single @media query:
:root {
--text-xs: clamp(0.75rem, 0.5vw + 0.65rem, 0.875rem);
--text-sm: clamp(0.875rem, 0.7vw + 0.75rem, 1rem);
--text-base: clamp(1rem, 1vw + 0.875rem, 1.25rem);
--text-lg: clamp(1.125rem, 1.2vw + 1rem, 1.5rem);
--text-xl: clamp(1.25rem, 1.5vw + 1.1rem, 1.875rem);
}The clamp() function has excellent support across all modern browsers and has been stable since 2020. It works in Chrome 79+, Firefox 75+, Safari 13.1+, and Edge 79+. For the small percentage of users on legacy browsers that do not support it, consider providing a fallback value immediately before the clamp declaration — older browsers will use the fallback while modern ones use the fluid value.